Question : Directions: In the following question, find the odd one out from the given alternatives.
Option 1: 13 : 25
Option 2: 31 : 63
Option 3: 21 : 41
Option 4: 19 : 37
Correct Answer: 31 : 63
Solution :
Let's check the options –
First option:
13 : 25; (13 × 2) – 1 = 26 – 1 = 25
Second option:
31 : 63; (31 × 2) – 1 = 62 – 1 = 61 ≠ 63
Third option:
21 : 41; (21 × 2) – 1 = 42 – 1 = 41
Fourth option:
19 : 37; (19 × 2) – 1 = 38 – 1 = 37
Only the second option doesn't follow the pattern. Hence, the second option is correct.
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