If n is a multiple of5 and ~$n=\left ( p^{2} \right )q$~, where p and q areprime numbers, which of the following must be a multiple of 25 ?


~$p^{2}$~

~$q^{2}$~

~$pq$~

~$p^{2}q^{2}$~

~$p^{3}q$~

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Prep2007E1-PS