1, 3, 5 and 15.
Yes.
15,15,3
(15,1)(5,3)
fifteen
Yes; fifteen times seven is one hundred and five.
2 is not a factor of odd numbers, like 15.
15 is a factor of 60.The proof: 15 x 4=60(It is, of course, not a prime factor.)
The GCF is 1.
The GCF is 3.
Because 45 is not a factor of 60, whereas 15 and 30 are.
The least common factor is 1. (The least common factor of any two or more positive integers is always 1.)
1 and 1/2 = 1.5 1.5<15