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      Question

      Find the difference between sum of digits of LCM and

      HCF of 28, 42 and 70.
      A 1 Correct Answer Incorrect Answer
      B 4 Correct Answer Incorrect Answer
      C 5 Correct Answer Incorrect Answer
      D 6 Correct Answer Incorrect Answer

      Solution

      28 = 2┬▓ ├Ч 7 42 = 2 ├Ч 3 ├Ч 7 And 70 = 2 ├Ч 5 ├Ч 7 So, HCF = 2 ├Ч 7 = 14 So, sum of digits of HCF = 1 + 4 = 5 And LCM = 2┬▓ ├Ч 3 ├Ч 5 ├Ч 7 = 420 And sum of digits of LCM = 4 + 2 + 0 = 6 So, required difference = 6 - 5 = 1 Hence, option a.

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