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      Question

      The square of sum of two numbers is 9,801 and the sum of

      squares of the same two numbers is 5,265. If their H.C.F. is 9, then find their L.C.M.
      A 189 Correct Answer Incorrect Answer
      B 252 Correct Answer Incorrect Answer
      C 315 Correct Answer Incorrect Answer
      D 225 Correct Answer Incorrect Answer

      Solution

      Let the two numbers be 'a' and 'b'

      We have, (a + b)² = 9801
      And, a² + b² = 5265

      (a + b) ² = a² + b² + 2ab = 5265 + 2ab

      Or, 2ab = 9801 - 5265 = 4536

      So, ab = 4536/2 = 2268

      Therefore, L.C.M = 2268 / 9 = 252

      Hence, option B.

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