Question
In the following number-pairs, the second number is
obtained by applying certain mathematical operations to the first number. In three of the four pairs, the same pattern is applied and hence they form a group. Select the number-pair that does NOT belong to this group. A. 2 : 5 B. 4 : 18 C. 6 : 39 D. 8 : 66Solution
22 + 1 = 5 42 + 2 = 18 62 + 3 = 39 82 + 4 = 68 Hence option 4 is the correct answer
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