1.

The least common multiple of 21 and 560 is: 1. 5602. 16803. 11204. 840

Answer» Correct Answer - Option 2 : 1680

Calculation:

Find the prime factorization of 21

⇒ 21 = 3 × 7

Find the prime factorization of 560

⇒ 560 = 2 × 2 × 2 × 2 × 5 × 7

Multiply each factor the greater number of times it occurs above to find the LCM.

⇒ LCM = 2 × 2 × 2 × 2 × 3 × 5 × 7

⇒ LCM = 1680

∴ The least common multiple of 21 and 560 is 1680.



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