If n is a multiple of 5 and n=p^2*q, where p and q are prime numbers, which of the following must be multiple of 25?
a)p^2
b)q^2
c)p^2*q^2
d)pq
e)q^3
Thanks
a)p^2
b)q^2
c)p^2*q^2
d)pq
e)q^3
Thanks
n=p^2*q = 5k (p,q are prime numbers)billyr wrote:If n is a multiple of 5 and n=p^2*q, where p and q are prime numbers, which of the following must be multiple of 25?
a)p^2
b)q^2
c)p^2*q^2
d)pq
e)q^3
Thanks
one of them must be 5. we don't know whether p=5 or q=5
p^2*q^2 --> ALWAYS MULTIPLE OF 25 (here it doesn't matter whether p=5 or q=5)
c
