Multiple choice

In the following number series only one number is missing. Find out the missing number. $4 \quad 9 \quad 25 \quad 49 \quad ?$

  1. 81

  2. 121

  3. 100

  4. 64

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The series is: 2^2 = 4, 3^2 = 9, 5^2 = 25, 7^2 = 49. These are squares of consecutive prime numbers: 2, 3, 5, 7. The next prime number is 11, and 11^2 = 121. Therefore, the missing number is 121.

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