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Actually it should either highest common factor or lowest common multiple. hcf :- you should constantly divide the two or more numbers where the divisor is able to divide all numbers . if cant be done from beggining then 1 is hcf. when after finishing till maximum the divisors u got will be multiplied and that is the hcf. for lcm u have to continue till al;l no.s come to 1 and multiply to get lcm