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      Question

      What is the largest sum of m and n such that

      β€˜4m932n6’ is divisible by 12?
      A 23 Correct Answer Incorrect Answer
      B 15 Correct Answer Incorrect Answer
      C 20 Correct Answer Incorrect Answer
      D 12 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Divisible by 12 β‡’ divisible by 3 and 4

      Last two digits: β€˜n6’ divisible by 4 β†’ n = 0, 2, 4, 6, 8

      Take maximum n = 8

      Sum = 4 + m + 9 + 3 + 2 + 8 + 6 = 32 + m

      32 + m divisible by 3 β†’ m = 1, 4, 7

      Max m = 7

      β‡’ max (m + n) = 7 + 8 = 15

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