In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. Select the set in which the numbers are related in the same way as are the numbers of the following sets. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
11 - 121
1 - 1

Question

Question

This question was previously asked in

RPF Constable 2024 Official Paper (Held On: 02 Mar, 2025 Shift 1)

Answer 1

The logic followed here is:

11 - 121 → 11² = 121

And,

1 - 1 → 12 = 1

Option 1) 9 - 81 → 92 = 81

Option 2) 2 - 8 → 22 = 4 ≠ 8

Option 3) 14 - 169 → 142 = 196 ≠ 169

Option 4) 4 - 64 → 42 = 16 ≠ 64

Thus, out of all the options, '9 - 81' follows the same logic as given.

Hence, "Option 1" is the correct answer.