find the lcm of 9 and 21 by prime factorisation method ( please show full method)
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Step-by-step explanation:
The prime factorization of 9 is: 3 x 3.
The prime factorization of 21 is: 3 x 7.
Eliminate the duplicate factors of the two lists, then multiply them once with the remaining factors of the lists to get lcm(9,9) = 63.
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