Question on Finding Rank of a Word Without Repetition

Duration: 11 min

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Inside: a video lesson and guided study material.

Module outline

  1. About Course: About the Course
  2. Section A: General Awareness: Polity, वैज्ञानिक उपलब्धियाँ और अनुसंधान / Scientific Achievements and Research, Biology, Chemistry, Static General Knowledge, History, Geography, Indian Economy, समसामयिकी / Current Affairs, Evolution of Indian Banking (Banking & Financial Awareness), Environment
  3. Section A: General Intelligence & Reasoning ability: श्रेणी / Series, कूट लेखन एवं कूट वाचन / Coding-Decoding, Data Sufficiency, अशाब्दिक तर्क / Non-Verbal Reasoning, Analytical Reasoning (Counting Figures Reasoning), रक्त संबंध / Blood Relations, Syllogisms, कथन आधारित तार्किक विवेचन / Statement-Based Reasoning, बैठक व्यवस्था एवं पहेलियाँ / Seating Arrangement and Puzzles, दिशा एवं दूरी / Direction and Distance, गणितीय संक्रियाएँ एवं लुप्त संख्या / Mathematical Operations and Missing Numbers, कैलेंडर एवं घड़ी / Calendar and Clock, Clock, घन, पासा एवं आकृतियों की गिनती / Cubes, Dice and Figure Counting, आँकड़ों की पर्याप्तता एवं निर्णय क्षमता / Data Sufficiency and Decision Making, वर्णमाला एवं संख्या परीक्षण / Alphabet and Number Test, Crypt Arithmetic, वेन आरेख, न्याय वाक्य एवं असमानता / Venn Diagrams, Syllogism and Inequalities, Data Arrangement, Inequality, सादृश्यता एवं वर्गीकरण / Analogy and Classification, क्रम एवं रैंकिंग / Order and Ranking, TCS NQT Advanced Reasoning Ability
  4. Section A: Arithmetical & Numerical Ability: अनुपात और समानुपात / Ratio and Proportion, Divisibility Rules, आँकड़ा निर्वचन / Data Interpretation, मिश्रण और एलिगेशन / Mixture and Alligation, Permutation and Combination, Logarithm, संख्या पद्धति / Number System, महत्तम समापवर्तक और लघुत्तम समापवर्त्य / HCF and LCM, Sequence and Series (Series), समय, चाल और दूरी / Time, Speed and Distance, प्रतिशत / Percentage, औसत / Average, लाभ, हानि और बट्टा / Profit, Loss and Discount, साधारण और चक्रवृद्धि ब्याज / Simple and Compound Interest, समय और कार्य / Time and Work, Pipe and Cistern, घन क्षेत्रमिति / Solid Mensuration, सरलीकरण, घातांक और करणी / Simplification, Indices and Surds, Algebra, Probability, Mental Ability, Age Problems, Partnership, Statistics, Arithmetic, Speed Mathematics and Basic Mathematics, Miscellaneous
  5. Section A: English Language & Comprehension: Vocabulary, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Verbs and Tenses, Reading Comprehension, Parts of Speech, Sentence Construction, Prepositions and Conjunctions, Direct and Indirect Speech, Sentence Completion (Fill in the blanks), Sentence Structure and Common Errors, Modals, Transformation of Sentences, Sentence Correction (Error Correction), Adverb, Conjunction, Cloze Test (Cloze Passage)
  6. Section A: Hindi Language & Comprehension: भाषा, लिपि और वर्ण, वर्तनी, वर्ण-विन्यास, अनुस्वार, अनुनासिक, चंद्रबिंदु और ‘र’ के रूप, शब्द, पद और शब्द-भेद, संज्ञा और सर्वनाम, पद-भेद और रूप-विकार, लिंग, वचन, पुरुष और कारक, काल, वाच्य, वाक्य और वाक्य-भेद, संधि, समास, विलोम शब्द, पर्यायवाची शब्द, सामान्य अशुद्धियाँ, अनेक शब्दों के लिए एक शब्द, शब्द-भंडार, अपठित बोध, Multi-Topic Content (Cross-Concept Material), वर्णमाला
  7. Section B: Programming, Data Structures, OOP & Java: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Java, OOPS with C++, Language Design, Intro to Compilers, Visual Basics, Syntax Analysis: Bottom-Up, Object Oriented Technology
  8. Section B: Computer Networks, TCP/IP & Network Security: Introduction to CN, Data Communication, DLL: Flow Control, DLL: Access Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Access Technologies, Network Security, Society, Law & Ethics, Mobile Computing, Net Layer:Routing Protocol, Cyber Safety and Security
  9. Section B: Teaching Methodology: वृद्धि और विकास / Growth and Development, Concept of Pedagogy, विकास के सिद्धांत / Theories of Development, समावेशी शिक्षा / Inclusive Education, Experiential Pedagogy, आकलन और मूल्यांकन / Assessment and Evaluation, समाजीकरण और जेंडर / Socialisation and Gender, National Education Policy (NEP) 2020, संज्ञानात्मक प्रक्रियाएँ / Cognitive Processes, शिक्षण योजना और शिक्षण कौशल / Teaching Planning and Teaching Skills, Personality Development, शिक्षण विधियाँ / Teaching Methods, अधिगम और व्यवहारवादी सिद्धांत / Learning and Behavioural Theories, Learners & Learning Process, Factors Affecting Teaching, शिक्षण विधियाँ एवं उपागम / Teaching Methods and Approaches, शिक्षण-अधिगम प्रक्रिया एवं कक्षा प्रबंधन / Teaching-Learning Process and Classroom Management, शिक्षण सहायक सामग्री एवं शैक्षिक तकनीकी / Teaching Aids and Educational Technology, सूक्ष्म शिक्षण एवं कक्षा संप्रेषण / Microteaching and Classroom Communication, आकलन एवं मूल्यांकन / Assessment and Evaluation, पाठ्यचर्या, कला एवं सह-शैक्षिक क्षेत्र / Curriculum, Arts and Co-curricular Areas, दिव्यांग बच्चों की शिक्षा / Education of Children with Disabilities, शिक्षक: गुण, व्यावसायिक नैतिकता एवं विकास / Teacher: Qualities, Professional Ethics and Development
  10. Section B: Digital Electronics / Boolean Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Analog-Digital Conversion
  11. Section B: Operating Systems & Linux: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, File Management, Disc Scheduling, Unix OS, Linux OS, Distributed Systems, Windows OS
  12. Section B: Data Base Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, File Organization & Indexing, Transaction Management, Concurrency Control, Database Security & Authorization, Database Recovery, Data Warehousing & Mining
  13. Section B: Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, HTML Basics, CSS, Emerging Technologies, JavaScript-Basics, .Net Programming, Electronic Data Interchange and E-Commerce, XML
  14. Section B: Computer Fundamentals, IT Basics & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Register Transfer and Microoperations, Control Unit Design, Programming the Basic Computer, Terms & Abbreviations, MS Office Applications, Instr Formats & Modes, Floating Point Rep, कंप्यूटर के मूल सिद्धांत / Computer Fundamentals, साइबर सुरक्षा / Cyber Safety and Security, कंप्यूटर सॉफ़्टवेयर / Computer Software, ऑपरेटिंग सिस्टम / Operating System, वर्ड प्रोसेसिंग (MS Word) / Word Processing (MS Word), कंप्यूटर नेटवर्क / Computer Networks, प्रेज़ेंटेशन (MS PowerPoint) / Presentation Software (MS PowerPoint)
  15. Section B: Python Language: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  16. Section B: Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, extras, Fundamentals of Systems and Information Systems
  17. Section B: Design & Analysis of Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  18. Section B: Mathematics: Linear Algebra, Calculus, Trigonometry, Vectors, Set Theory, Functions, Relations, Propositional and Predicate Logic, Research Process Steps, Graph Theory, समुच्चय, संबंध, फलन और विविक्त गणित / Sets, Relations, Functions and Discrete Mathematics, संख्या पद्धति और संख्या सिद्धांत / Number Systems and Number Theory, यूक्लिडीय ज्यामिति और क्षेत्रमिति / Euclidean Geometry and Mensuration, सांख्यिकी और प्रायिकता / Statistics and Probability, निर्देशांक ज्यामिति, सदिश और त्रिविमीय ज्यामिति / Coordinate Geometry, Vectors and 3D Geometry, बहुपद, समीकरण और सम्मिश्र संख्याएँ / Polynomials, Equations and Complex Numbers, समतल क्षेत्रमिति / Plane Mensuration, प्रतिचयन / Sampling
  19. Section B: Computer Graphics, Multimedia & Mobile Computing: Basics of Computer Graphics, 2-D Geometrical Transforms and Viewing, 3-D Object Representation, Geometric Transformations and Viewing, Multimedia
  20. Section B: Emerging Trends: Emerging Tech Trends, Knowledge Representation, Natural Language Processing, व्यापार, विपणन एवं उपभोक्ता संरक्षण / Trade, Marketing and Consumer Protection
  21. DSSSB Previous Year Paper:
  22. Business Studies and Management: Business Communication, प्रबंध के सिद्धांत एवं कार्य / Principles and Functions of Management, लेखांकन के आधार एवं लेन-देनों का अभिलेखन / Accounting Fundamentals and Recording of Transactions, Business Economics, ह्रास, अंतिम खाते व कंप्यूटरीकृत लेखांकन / Depreciation, Final Accounts and Computerised Accounting, Knowledge Management & New Economy
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video, presented by Yash Jain from Knowledge Gate Educator, is a comprehensive tutorial on the mathematical concept of 'Rank of a Word' in permutations and combinations, specifically for words with no repeated letters. The video begins with an introduction to the topic, using a title slide that clearly states 'Rank of a Word (Without Repetition)'. The core of the lesson is a detailed, step-by-step worked example to find the rank of the word 'MOTHER'. The instructor uses a whiteboard to demonstrate the method: first, he lists the letters of the word in alphabetical order (E, H, M, O, R, T), then calculates the number of words that can be formed starting with each letter that comes before 'M' in the alphabet. He uses the formula for permutations (n!) to calculate the number of such words (e.g., 5! for words starting with E or H). The calculation proceeds by summing these values and adding 1 for the word itself, resulting in a final rank of 240 + 48 + 18 + 1 = 307. The video also includes a brief, humorous interlude with a series of Indian mom memes to engage the audience, but the primary focus remains on the mathematical method. The video concludes with a final slide summarizing the calculation and a 'Thanks for Watching' screen.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title slide for a lesson on 'Permutation' and 'Combination', featuring a collage of images like a roulette table and a fruit basket. This transitions to a presentation slide titled 'Confused' with the question 'Should I unlock with Permutation or Combination?'. The slide visually contrasts a 'Permutation' lock (where order matters) with a 'Combination' lock (where order does not matter), using a detective character to illustrate the confusion. The instructor, Yash Jain, is visible in a small window, introducing the topic. The video then moves to a new slide with a pink background and space-themed graphics, clearly stating the lesson's title: 'Rank of a Word (Without Repetition)'. The instructor begins to explain the concept, setting the stage for the main problem.

  2. 2:00 – 5:00 02:00-05:00

    The video displays a series of humorous memes related to Indian mothers, such as 'INDIAN MOMS BE LIKE' and 'Every MOM'S Reaction', to entertain the audience. The instructor, Yash Jain, is seen in a small window, likely providing commentary. This segment serves as a brief interlude. The video then transitions to a new slide with the question 'q: Find the rank of the most precious word of dictionary?'. The instructor uses this as a setup to introduce the main problem, which is to find the rank of the word 'MOTHER'. The slide shows a meme of a woman in a royal chair, with text in Hindi, which the instructor explains is a common way to express the idea of a 'precious' word. The instructor then begins to explain the method for finding the rank of a word.

  3. 5:00 – 10:00 05:00-10:00

    The video focuses on the core mathematical problem: finding the rank of the word 'MOTHER'. The instructor, Yash Jain, uses a whiteboard to demonstrate the step-by-step process. He first writes the word 'MOTHER' and then lists its letters in alphabetical order: E, H, M, O, R, T. He explains that to find the rank, we need to count all the words that come before 'MOTHER' in a dictionary. He starts with the letter 'M'. The letters that come before 'M' are 'E' and 'H'. He calculates the number of words starting with 'E' as 5! (120) and the number of words starting with 'H' as 5! (120). He then moves to the next letter, 'O', and calculates the number of words starting with 'MO' that come before 'MOTHER'. He identifies the letters that come before 'O' in the remaining set (E, H, R, T), which are 'E', 'H', and 'R'. He calculates 3 * 4! (72) for these words. He continues this process for the remaining letters, calculating 2 * 3! (12) for words starting with 'MOH', and 1 * 2! (2) for words starting with 'MOTH'. The final calculation is 120 + 120 + 72 + 12 + 2 + 1 = 327. The instructor then corrects his calculation, stating the final rank is 307, which is the sum of 240 (120+120) + 48 (3*4!) + 18 (2*3!) + 1 (1*2!) + 1 (the word itself). The instructor explains that the final answer is 307.

  4. 10:00 – 11:17 10:00-11:17

    The video transitions to a final summary slide. The instructor, Yash Jain, is visible in a small window. The main slide shows the completed calculation for the rank of 'MOTHER'. The letters are listed in alphabetical order: E, H, M, O, R, T. The calculation is shown as 5! + 5! + 3*4! + 2*3! + 1*2! + 1, which equals 120 + 120 + 72 + 12 + 2 + 1 = 327. The instructor then corrects this, stating the final rank is 307. The video then shows a slide with a list of tasks for the audience, such as 'Touch HER Feet' and 'Hug HER', with difficulty levels. The video concludes with a 'Thanks for Watching' screen, which is a black background with an orange box containing the text 'THANKS FOR WATCHING'.

The video provides a clear and structured lesson on calculating the rank of a word in a dictionary, a key topic in permutations and combinations. It begins with a conceptual introduction, using a relatable analogy of a lock to distinguish between permutation and combination. The main body of the video is a detailed, step-by-step worked example for the word 'MOTHER'. The instructor methodically breaks down the problem by considering each letter in the word and calculating the number of valid permutations that would come before it in the dictionary. The use of a whiteboard for the calculation makes the process transparent and easy to follow. The video effectively combines rigorous mathematical instruction with light-hearted, culturally relevant memes to maintain student engagement, culminating in a clear final answer and a summary of the method.

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