Select the option that is related to the fifth number in the same way as the fourth number is related to the third number and the second number is related to the first number.
37 : 43 :: 23 : 31 :: 17 : ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 23.
37 : 43 ⇒ 37 → Next alternate prime number → 43
23 : 31 ⇒ 23 → Next alternate prime number → 31
Similarly, 17 : ? ⇒ 17 → Next alternate prime number → 23