1 and the highest common factor is 15
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Greatest common factor of 30 and 75 is 15.
The Least Common Multiple (LCM) of 5, 15, and 75 is 75.
It is 15
The Common Factors of 15 and 75 are 1, 3, 5, 15
There cannot be a least common factor of just one number. To be common there need to be at least two numbers.