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) are followed in all the number pairs, EXCEPT one. Find that odd number pair.Solution
The Logic: The second number is obtained by subtracting 2 from the first number and then multiplying the result by 3. Option A (12 : 30) → (12 – 2) x 3 = 10 x 3 = 30 Option B (16 : 42) → (16 – 2  x 3 = 14 x 3 = 42 Option C (20 : 56) → (20 – 2) x 3 = 18 x 3 = 54 Option D (24 : 66) → (24 – 2) x 3 = 22 x 3 = 66
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