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.
(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13-Operations on 13 such as adding subtracting multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
216 : 40
72 : 22
112 : 32
312 : 82
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 216 : 40.
Logic: 1st number = [(2nd number × 4) - 16]
(1) 216 : 40 ⇒ [(40 × 5) + 16] ⇒ (200 + 16) = 216
(2) 112 : 32 ⇒ [(32 × 4) -16] ⇒ (128 - 16) = 112
(3) 312 : 82 ⇒ [(82 × 4) -16] ⇒ (328 - 16) = 312
(4) 72 : 22 ⇒ [(22 × 4) - 16] ⇒ (88 - 16) = 72