📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

  • google app store apple app store
  • ✖

      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.
      A 268: 208 Correct Answer Incorrect Answer
      B 551: 102 Correct Answer Incorrect Answer
      C 635: 140 Correct Answer Incorrect Answer
      D 397: 282 Correct Answer Incorrect Answer

      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

      Practice Next
      ask-question