Question

Three of the following four pair of numbers are alike in a certain way and so they form a group. Which is the one that does not belong to the group?

• A. 2.10
• B. 3, 26
• C. 5,124
• D. 4,63

Answer 1

Answer:

A. 2.10

The number pair that does not belong to the group is 2, 10.

## The Logic:

In the other three pairs, the relationship follows the formula: $(n^3 - 1)$ (The second number is the cube of the first number minus 1).

* 3, 26 $\implies 3^3 - 1 = 27 - 1 = \mathbf{26}$ (Matches)

* 5, 124 $\implies 5^3 - 1 = 125 - 1 = \mathbf{124}$ (Matches)

* 4, 63 $\implies 4^3 - 1 = 64 - 1 = \mathbf{63}$ (Matches)

The Odd One Out:

* 2, 10 $\implies 2^3 - 1 = 8 - 1 = \mathbf{7}$ (Does not match, as the given number is 10).