find the LCM and H C F for following integers by prime factorisation method
-12 ,15 and 21
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factors of 12 = 2²○-3 [where ○ means multipication sign]
factors of 15=5○3
factors of 21=7○3
HCF of 12,15,21= 3
LCM of 12,15,21=2²○-3○3○5○7=-311
factors of 15=5○3
factors of 21=7○3
HCF of 12,15,21= 3
LCM of 12,15,21=2²○-3○3○5○7=-311
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