Find the LCM and HCF Of 12,15 and 21 by applying the prime factorisation method.

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asked Jan 29, 2018 in Mathematics by sforrest072 (157,439 points) 61 410 937

Find the LCM and HCF Of 12,15 and 21 by applying the prime factorisation method. 

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answered Jan 29, 2018 by mdsamim (213,225 points) 5 10 15
edited Jan 29, 2018 by mdsamim
 
Best answer

The correct answer is

22,31,51 and 71 are the greatest powers involved in the prime  factors of 12,15 and 21.

so,LCM (12,15,21) =22X31X51X71=420

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