Select the number that can replace the question mark (?) in the following series.
4, 25, 121, ? , 529, 961
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e 289
| Understanding | Application |
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Given series: 4, 25, 121, ? , 529, 961 → 22, 52, 112, ?, 232, 312 This is a series of alternate prime numbers. |
Hence, the complete series will be → 2, 5, 11, 17, 23, 31 On squaring these numbers, we get: 4, 25, 121, 289, 529, 961. Hence, the missing number is 289. |