Find the missing term in the following number series : 2, 9, 28, ?, 126, 217,…
2024
Find the missing term in the following number series : 2, 9, 28, ?, 126, 217, 344
- A.
37
- B.
65
- C.
91
- D.
115
Attempted by 52 students.
Show answer & explanation
Correct answer: B
The given series is: 2, 9, 28, ?, 126, 217, 344.
Step 1: Observe the pattern in the series.
Check if the terms follow the formula n³ + 1.
For n = 1: 1³ + 1 = 2
For n = 2: 2³ + 1 = 8 + 1 = 9
For n = 3: 3³ + 1 = 27 + 1 = 28
For n = 4: 4³ + 1 = 64 + 1 = 65
For n = 5: 5³ + 1 = 125 + 1 = 126
For n = 6: 6³ + 1 = 216 + 1 = 217
For n = 7: 7³ + 1 = 343 + 1 = 344
Thus, the missing term is 65.
हिन्दी उत्तर:
दी गई श्रेणी है: 2, 9, 28, ?, 126, 217, 344।
चरण 1: श्रेणी में पैटर्न का अवलोकन करें।
सत्यापित करें कि पद n³ + 1 के नियम का पालन करते हैं।
n = 1 के लिए: 1³ + 1 = 2
n = 2 के लिए: 2³ + 1 = 8 + 1 = 9
n = 3 के लिए: 3³ + 1 = 27 + 1 = 28
n = 4 के लिए: 4³ + 1 = 64 + 1 = 65
n = 5 के लिए: 5³ + 1 = 125 + 1 = 126
n = 6 के लिए: 6³ + 1 = 216 + 1 = 217
n = 7 के लिए: 7³ + 1 = 343 + 1 = 344
इसलिए, लुप्त पद 65 है।