The least common factor of any set of integers is 1.
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1 is the LCF of 30 and 70.
If 1 cannot be considered as a proper factor then 2 is the LCF of 30 and 70
LCM(2, 70) = 70. The least common factor of any set of positive integers is 1.
The Least Common Multiple (LCM) for 30 70 is 210.
7 and 70
210
630