Three of the following number-pairs are alike in a certain way and one is different. Select the odd one.
Answer & explanation
Correct answer: option 2
The logic followed here is :
(Second number + 1) + Second number = ist number
271 : 15 ⇒ 15 + 1 ⇒ 162 + 15 = 271
398 : 18 ⇒ 18 + 1 ⇒ 192 + 18 = 379 ≠ 398 (odd)
181 : 12 ⇒ 12 + 1 ⇒ 132 + 12 = 181
305 : 16 ⇒ 16 + 1 ⇒ 172 + 16 = 305