find HCF by multiplication method 9 and 15
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Prime Factorisation Method:
9 = 3²
15 = 3 × 5
HCF = product of common factors with lowest power
==> HCF = 3
Euclid Division Algorithm:
==> 15 = 9 × 1 + 6
==> 9 = 6 × 1 + 3
==> 6 = 3 × 2 + 0
Hence, HCF = 3
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