Multiple choice

Which of the following sets of numbers have 140ab as LCM?

  1. 10ab, 20ab, 28ab

  2. 11ab, 21ab, 28ab

  3. 12ab, 20ab, 14ab

  4. 20ab, 26ab, 14ab
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A Correct answer
Explanation

10ab, 20ab, 28ab Factors of 10ab = 2 × 5 × a × b Factors of 20ab = 2 × 2 × 5 × a × b Factors of 28ab = 2 × 2 × 7 × a × b LCM = 140ab

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