The second number in the given number pairs is obtained by performing certain mathematical operation...........

General Intelligence and Reasoning (CHSL) Classification

The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number.

The same operation(s) is/are followed in all the number-pairs, except one. Find that odd number-pair.

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SSC CHSL 31st May 2022 Shift-1

48:7

25:8

15:4

8:3

- Let's break down each pair using a consistent operation.

- 48:7 - Likely done by taking digits of the first number (4 and 8), summing them up (4 + 8 = 12), and subtracting 5 (12 - 5 = 7).

- 25:8 - Taking digits of the first number (2 and 5), their sum is 7. However, the second number is 8, which does not match.

- 15:4 - Sum the digits (1 + 5 = 6), then subtract 2 (6 - 2 = 4), which aligns.

- 8:3 - Sum is just 8, and subtracting 5 gives 3, matching the pair.

- Overall, the pattern involves summing digits and subtracting a specific number to result in the second number.

Option 2: 25:8 is the odd one out.

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