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2014-07-28T10:17:09+05:30

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We find the factors of 6 & 21 by Prime Factorisation Method:
6 = 2 × 3
21 = 3 × 7

Hence, L.C.M. of the 6 & 21 is :
2 × 3 × 7
= 42 ( Required L.C.M.)
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2014-07-28T11:00:44+05:30
First of all we have to factorize 6 and 21
Factorized form of 6=2*3
Factorized form of 21=7*3

Hence LCM of 6 and 21,
it is 2*3*7 which multiplies 42.
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