Multiple choice

Choose the correct alternatives from the given options that will complete the series. $25, 49, 121, 289, ?$

  1. $529$
  2. $625$
  3. $329$
  4. $225$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Each term is the square of consecutive prime numbers: 5²=25, 7²=49, 11²=121, 17²=289. The next prime is 23, and 23²=529. The primes used are 5, 7, 11, 17, 23 - check that each is prime and consecutive.

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