Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the one that is different.
Answer & explanation
Correct answer: option 3
The logic is :
(Ist number)2 + 2 = second number
17 : 291 - (17)2 + 2 = 291
15 : 227 - (15)2 + 2 = 227
13 : 169 - (13)2 = 169 (odd)
11 : 123 - (11)2 + 2 = 123