Multiple choice

Directions: In the following question, four numbers are given out of which, three are alike in a certain way but one is different. Choose the one which is different from the rest of the three.

  1. 15

  2. 63

  3. 143

  4. 257
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The numbers 15, 63, and 143 are all composite odd numbers (15 = 3×5, 63 = 7×9, 143 = 11×13). However, 257 is a prime number (only divisible by 1 and itself), making it the odd one out in this set.

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