Find the HCF and LCM.i. 23, 69 ii. 21, 49, 84 – InterviewSolution

1.

Find the HCF and LCM.i. 23, 69 ii. 21, 49, 84

Answer»

i. 23 = 23 x 1

69 = 3 x 23

∴ HCF of 23 and 69 = 23

∴ LCM of 23 and 69 = 23 x 3

= 69

ii. 21 = 3 x 7

49 = 7 x 7

84 = 2 x 42

= 2 x 2 x 21

= 2 x 2 x 3 x 7

∴ HCF of 21, 49 and 84 = 7

∴ LCM of 21, 49 and 84 = 7 x 3 x 7 x 2 x 2

= 588

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