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 its constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
(12, 77, 5)
(21, 87, 3)
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. (15, 127, 7).
Logic: 1st number × (3rd number + 1) + 3rd number = 2nd number
(12, 77, 5) → 12 × (5 + 1) + 5 = 77
(21, 87, 3) → 21 × (3 + 1) + 3 = 87
Similarly, (15, 127, 7) → 15 × (7 + 1) + 7 = 127