Multiple choice

A series is given with one term/number missing. Choose the correct alternative from the given ones that will complete the series. $25, 49, 121, ?, 289$

  1. $529$
  2. $169$
  3. $329$
  4. $225$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The series is 25, 49, 121, ?, 289. Each number is a perfect square: 5²=25, 7²=49, 11²=121, 17²=289. The bases 5, 7, 11, 17 are consecutive prime numbers. The missing base between 11 and 17 is 13, giving 13²=169. Option B (169) correctly completes the pattern.

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