Question

find the lcm and hcf of 12 ,15and 21 by prime factorisation method

Answer 1

Answer:

$12 = 2 \times 2 \times 3 \\ 15 = 3 \times 5 \\ 21 = 3 \times 7 \\ \\ lcm \: = 420 \\ hcf = 3$

Step-by-step explanation:

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Answer 2

Answer:

LCM = 420 HCF = 3