The greatest common multiple of any set of integers is infinite.
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Least Common Multiple (LCM) for 2 5 is 10
The least common multiple of 3 and 5 is 15. This, however is not a multiple of 2 so we must find the next common multiple of 3 and 5. This is 30. Since 30 is also a multiple of 2, 30 is therefore the least common multiple of 3, 5 and 2.
80= 2*2*2*2*5 35= 5*7 The only factor they have in common is 5, so the answer is 5.
The least common multiple of 5 , 7 , 2 = 70
The numbers are 5 and 10.