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If two numbers are 21 and 31, what is the product of their HCF and LCM?

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Question: If two numbers are 21 and 31, what is the product of their HCF and LCM?

  1. 652
  2. 650
  3. 653
  4. 651

Correct Answer: D — 651

Explanation: For two positive integers, HCF × LCM equals their product.
Using the values in this question gives 651 as the correct answer.

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