Question : Directions: Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different from the rest.
Option 1: 24 : 51
Option 2: 18 : 49
Option 3: 7 : 37
Option 4: 13 : 29
Correct Answer: 18 : 49
Solution : Let's check each option –
First option:
24 : 51 → 24 + 51 = 75 (Non – prime number)
Second option:
18 : 49 → 18 + 49 = 67 (prime number)
Third option:
7 : 37→ 7 + 37 = 44 (Non – prime number)
Fourth option:
13 : 29 → 13 + 29 = 42 (Non – prime number)
So, the sum of all pairs is non prime number whereas the sum of option second is a prime number. Hence, the second option is correct.
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