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# n and p..............Indices and Prime number.............

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Manager
Joined: 02 Sep 2008
Posts: 103
n and p..............Indices and Prime number............. [#permalink]

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26 Apr 2009, 13:12
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0% (00:00) correct 100% (00:44) wrong based on 1 sessions

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If n and p are different positive prime numbers, which of the integers n^4,p^3 and np has (have) exactly 4 positive divisors?
(A) n^4 only
(B) p^3 only
(C) np only
(D) n^4 and np
(E) p^3 and np
Manager
Joined: 05 Jan 2009
Posts: 78
Re: n and p..............Indices and Prime number............. [#permalink]

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26 Apr 2009, 14:11
E.
p^3->(3+1)=4; np->(1+1)*(1*1)=4
Manager
Joined: 19 Aug 2006
Posts: 238
Re: n and p..............Indices and Prime number............. [#permalink]

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26 Apr 2009, 18:00
I got the same answer, E, by picking numbers.
Re: n and p..............Indices and Prime number.............   [#permalink] 26 Apr 2009, 18:00
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