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the least common factor of 5 and 15 is 5 because there are no more factors for five (5) u can do 2 times 2 but u get 4 u can not get five any other way and fifteen least common factor is 3 but u are asking what is 5 and 15 u can times 5 to get 15 and that is the least u can go so yo answer iS FIVE

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16y ago

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