# Three of the number pairs are alike in a certain way and one is differ

| Three of the number pairs are alike in a certain way and one is different. Pick the odd number- pair out.

A. 27 : 51

B. 11 : 2

C. 23 : 13

D. 51 : 26

### Right Answer is: A

#### SOLUTION

The sum of the square of the digits of the first number in the pair is equal to the second number of the pair except for, option A,

11 -> 1^{2} + 1^{2} = 2

23 -> 2^{2} + 3^{2} = 13

51 -> 5^{2} + 1^{2} = 26

But,

27 -> 2^{2} + 7^{2} = 53 which is not equal to 51

Hence, option A is the correct response.

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Three of the number pairs are alike in a certain way and one is differ