Question : Directions: Four number-pairs are given out of which three are alike in a certain way and one is different. Select the number-pair that is different from the rest.
Option 1: 5 : 7
Option 2: 17 : 23
Option 3: 13 : 19
Option 4: 31 : 41
Correct Answer: 5 : 7
Solution : Let's check each option –
First option:
5 : 7; These are the consecutive prime numbers.
Second option:
17 : 23; These are not the consecutive prime numbers.
Third option:
13 : 19; These are not the consecutive prime numbers.
Fourth option:
31 : 41; These are not the consecutive prime numbers.
So, the first option is different from the others. Hence, the first option is correct.
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