Find the number that can replace Qmark (?) in the series given below. 7, 12,…
2025
Find the number that can replace Qmark (?) in the series given below.
7, 12, 32, 122, ?, 3602, 25202
Answer: A. 602 — Key pattern: each term = previous term × position − consecutive even numbers (2, 4, 6, ...). Term 2: 7 × 2 − 2 = 14 − 2 = 12 Term 3: 12 × 3 − 4 = 36 − 4 = 32…
- A.
602
- B.
610
- C.
702
- D.
622
Attempted by 21 students.
Show answer & explanation
Correct answer: A
Key pattern: each term = previous term × position − consecutive even numbers (2, 4, 6, ...).
Term 2: 7 × 2 − 2 = 14 − 2 = 12
Term 3: 12 × 3 − 4 = 36 − 4 = 32
Term 4: 32 × 4 − 6 = 128 − 6 = 122
Term 5 (missing): 122 × 5 − 8 = 610 − 8 = 602
Term 6: 602 × 6 − 10 = 3612 − 10 = 3602
Term 7: 3602 × 7 − 12 = 25214 − 12 = 25202
Answer: 602
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