find the LCM and HCF using factorization method of
639 and 1078
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639 = 3² x 71
1078 = 2 x 7² x 11
HFC = 1 (since there is no other common factor between them)
LCM = 2 x 3² x 7² x 11 x 71 = 688 842
Answer: HCF = 1, LCM = 688 842
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