a × b = ________ ×LCM
1) Prime numbers
2)Composite numbers
3) HCF
4) Perfect number
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In arithmetic and number theory, the least common multiple, lowest common multiple, or smallest common multiple of two integers a and b, usually denoted by lcm(a, b), is the smallest positive integer that is divisible by both a and b.
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HCF.......
because by the
rule ...
1st no. ×2nd no. (of which we are going to find HCF and LCM) =HCF × LCM
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