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set 24 - #20

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Re: set 24 - #20

by niks_01.27 » Sun Sep 16, 2007 1:35 pm
Anonymous wrote:If n and p are different positive prime numbers, which of the integers , and np has (have) exactly 4 positive divisors?
(A) n4 only
(B) p3 only
(C) np only
(D) n4 and np
(E) p3 and np
Is the question typed correctly?
regards
niks...
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