Four number-pairs have been given, out of which three are…

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.

Show answer & explanation

Correct answer: B

Explanation

The correct answer is option 2 i.e 25/41: 8

Understanding
The logic used here is: 1) 4/5 : 3 ⇒ 4 + 5 = 9 = 3² 2) 25/41 : 8 ⇒ 25 + 41 = 66 is not a perfect square. 3) 16/20 : 6 ⇒ 16 + 20 = 36 = 6² 4) 30/51 : 9 ⇒ 30 + 51 = 81 = 9² Hence, 25/41: 8 is the odd one out.

Understanding

The logic used here is:

1) 4/5 : 3 ⇒ 4 + 5 = 9 = 3²

2) 25/41 : 8 ⇒ 25 + 41 = 66 is not a perfect square.

3) 16/20 : 6 ⇒ 16 + 20 = 36 = 6²

4) 30/51 : 9 ⇒ 30 + 51 = 81 = 9²

Hence, 25/41: 8 is the odd one out.

SSC CGL 2020 PYQ — Question 88