find the hcf of the following numbers using prime factorisation metho 1000,1825
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100 1825
/ \ / \
25 4 25 73
/ \ / \ / \
5 5 2 2 5 5
100 = 2 x 2 x 5 x 5
1825 = 5 x 5 x 73
HCF= Every prime number they have in common times together = 5x5 = 25
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