Question

WHAT will be the LCM of 12,15 and 21

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Answer 1

Answer:

Least Common Multiple is :

420

Calculate Least Common Multiple for :

12, 15 and 21

Factorize of the above numbers :

12 = 22 • 3

15 = 3 • 5

21 = 3 • 7

Build a prime factors table

Number of times each prime factor

appears in the factorization of :

Prime

Factor Number

12 Number

15 Number

21 L.C.M

(max)

2 2 0 0 2

3 1 1 1 1

5 0 1 0 1

7 0 0 1 1

LCM = 22 • 3 • 5 • 7

Least Common Multiple is :

420

Explanation:

420 is the answer

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Answer 2

Answer:

Refers to the attachment