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
11: 38 → (11 × 3) + 5 = 33 + 5 = 38
18: 59 → (18 × 3) + 5 = 54 + 5 = 59
22: 71 → (22 × 3) + 5 = 66 + 5 = 71
13: 42 → (13 × 3) + 5 = 39 + 5 = 44 (should be 44, not 42)
So, 13: 42 is the odd number-pair.
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