Question

applying the prime factorisation method find H.C.F and L.C.M of 12, 15, and 21​

Answer 1

Step-by-step explanation:

To find Hcf

12=3×2×2

15=5×3

21=7×3

Hcf= 3

to find lcm

Lcm=3×2×2×5×7

=420

that's all

Answer 2

Answer:

Here ur ans:-

H.C.F :-

Prime factorization of 12 - 2×2×3

Prime factorization of 15 - 3×5

Prime factorization of 21 - 3×7

H.C.F of 12,15 and 21 - 3 is ur ans.

L.C.M :-

Prime factorization of 12 - 2×2×3

Prime factorization of 15 - 3×5

Prime factorization of 21 - 3×7

L.C.M of 12,15 and 21 - 3×2×2×5×7 = 420 is ur ans , because the no. 3 has appeared in all so we write only one and also we will multiple other numbers.

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