Answers

2016-03-20T20:45:34+05:30
12=2*3*2
15=3*5
21=7*3
HCF=210
LCM=3
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2016-03-20T21:00:27+05:30
12= 2×2×3
15=3×5
21=3×7
so,HCF of 12,15,21 = 3
LCM of 12,15,21 = 3×2×2×5×7 =420
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