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      Question

      Select the option that is related to third number

      cluster in the same way second number cluster is related to first number cluster. 12 : 9 :: 13 : ?
      A 18 Correct Answer Incorrect Answer
      B 22 Correct Answer Incorrect Answer
      C 12 Correct Answer Incorrect Answer
      D 16 Correct Answer Incorrect Answer

      Solution

      The logic followed here is as follows: The second number is the sum of all the digits of the square of first number. 12 β†’ 12 Γ— 12 = 144 β†’ [1 + 4 + 4] = 9
      Similarly, in 13 β†’ 13 Γ— 13 = 169 β†’ [1 + 6 + 9] = 16

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