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.
Answer & explanation
Correct answer: option 2
The logic followed here is:
sum of all digits of ist number and then square of that number and we get the second number
(812, 121) → 8 + 1 + 2= 11 ⇒ 112 = 121
(547, 258) → 5 + 4 + 7= 16 ⇒ 162 = 256 (odd)
(723, 144) → 7 + 2 + 3 = 12 ⇒ 122 = 144
(546, 225) → 5 + 4 + 6 = 15 ⇒ 152 = 225