Question

Four numbers have been given, out of which three are alike in some manner and one is different. Select the number that is different from the rest.
1. 21
2. 735
3. 621
4. 853

Answer 1

Correct Answer - Option 4 : 853

In the given numbers:

We see the factor of all given numbers.

21 → 1, 3, 7 और 21.

735 → 1, 3, 5, 7, 15, 21, 35, 49, 105, 147, 245 and 735.

621 → 1, 3, 5, 9, 15, 21, 35, 49, 105, 147, 245 and 735.

853 → 1 and 853 

853 is a prime number and 441, 735 and 621 is non prime numbers.

Hence, 853 is an odd one in all numbers.