Answers

2016-04-25T19:59:23+05:30
L.c.m = 2 x 2 x 3 x 7 x 5 = 420
h.c.f = 3
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2016-04-25T20:00:31+05:30
12 = 2² x 3
15 = 3 x 5
21 = 3 x 7
LCM(12,15,21) = 3
HCF(12,15,21) = 2² X 3 X 5 X 7
                         = 420
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