Question
Four number-pairs are given, out of which three are
alike in a certain manner and one is different. Choose the different number pair.Solution
The logic followed here is as follows: The square of each digit of the 1st number is added together and then, the resultant is multiplied by 2 to obtain the 2nd number. 268: 208 → [2 × {(2)² + (6)²+ (8)² }] = [2 × {4 + 36 + 64}]= [2 × 104] = 208 551: 102 → [2 × {(5)² + (5)² + (1)² }] = [2 × {25 + 25 + 1}]= [2 × 51] = 102 635: 140 → [2 × {(6)² + (3)² + (5)² }] = [2 × {36 + 9 + 25}]= [2 × 70] = 140 397: 282 → [2 × {(3)² + (9)² + (7)² }] = [2 × {9 + 81 + 49}]= [2 × 139] = 278 ≠ 282
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