In order to determine the Greatest Common Factor (GCF) two or more numbers need to be provided. The question only provided one, 75, so the question is invalid.
If you want to be picky, the Greatest Factor of 75 is 75.
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If you mean 300 and 450 then the GCF is 150
GCF of 90 and 75 is 15.
The GCF is 1.
The GCF of 65 and 75 is 5.
Since 15 is a factor of 75, it is automatically the GCF. Since 75 is a multiple of 15, it is automatically the LCM.