Question
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.Solution
The pattern followed here is as follows:
(First number × 3) + 5 = Second number
18: 59 → (18 × 3) + 5 = 54 + 5 = 59
20: 65 → (20 × 3) + 5 = 60 + 5 = 65
11: 38 → (11 × 3) + 5 = 33 + 5 = 38
19: 61 → (19 × 3) + 5 = 57 + 5 = 62 (should be 62, not 61)
24: 77 → (24 × 3) + 5 = 72 + 5 = 77
So, 19: 61 is the odd number-pair.
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