Question : Directions: 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.
Option 1: 18 : 42
Option 2: 1 : 6
Option 3: 15 : 34
Option 4: 7 : 18
Correct Answer: 18 : 42
Solution :
Let's check each option –
First option:
18 : 42; (18 × 2) + 4 = 36 + 4 = 40 ≠ 42
Second option:
1 : 6; (1 × 2) + 4 = 2 + 4 = 6
Third option:
15 : 34; (15 × 2) + 4 = 30 + 4 = 34
Fourth option:
7 : 18; (7 × 2) + 4 = 14 + 4 = 18
Hence, the first option is correct.
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