If r and s are positive integers, is r/s an integer?
(1) Every factor of s is also a factor of r.
(2) Every prime factor of s is also a prime factor of r.
I think each statement is not sufficient alone
I statement cannot be because suppose
8 and 12, they both have 2 as a factor but 8/12 is not integer
8 and 4, they both have 2 as a factor 8/4 is integer
that is why is not sufficient
we know that 2 is even prime and examples from first statement can be given there and again it is not sufficient
combined together they give nothing more than alone, so I think it is E