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: 15 : 34
Option 2: 1 : 6
Option 3: 7 : 18
Option 4: 18 : 42
Correct Answer: 18 : 42
Solution :
Let's check the options –
First option:
15 : 34; 15 × 2 = 30; 30 + 4 = 34
Second option:
1 : 6; 1 × 2 = 2; 2 + 4 = 6
Third option:
7 : 18; 7 × 2 = 14; 14 + 4 = 18
Fourth option:
18: 42; 18 × 2 = 36; 36 + 4 = 40 ≠ 42
So, only the fourth option is different from the other three options. Hence, the fourth option is correct.
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