Use prime factorisation find HCF of
$45 and 75$

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Solution

Prime factorisation of $45 and 75$ are:
Prime factors of $45 = 3 x 3 x 5$
Prime factors of $75 = 3 x 5 x 5$
∴ Common factors are $3 a n d 5$
Hence, H.C.F. of $45 and 75$ is $15$ .

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