Question

find the LCm and HCF of 15,18 and 45 by the prime factorisation method
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Answer 1

Answer:

15=3×5

18=2×3×3

45=5×3××3

so here common numbet is 3

so h.c.f. is 3.

Answer 2

LCM=12150

1. 15=5×3
2. 18=2×3×3
3. 45=5×3×3

HCF=3