N is a prime number bigger than 5. Which of the following : PS Archive
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# N is a prime number bigger than 5. Which of the following

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N is a prime number bigger than 5. Which of the following [#permalink]

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14 Aug 2005, 19:46
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N is a prime number bigger than 5. Which of the following expressions must be even?

(a) (N+2)^2.
(b) N^2+2.
(c) N(N+2).
(d) (N+1)(N+2).
(e) (N â€“ 2)^2.

(Edit: I have edited the OP to add the power signs. Himalaya, please edited it back if this was not the correct version. - Hong)
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14 Aug 2005, 23:39
Does (N+2)2 denote (N+2)^2?

If so, the correct answer is (N+1)*(N+2), because (N+1) must be an even integer.
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15 Aug 2005, 05:12

a) (N+2)^2.
(b) N^2+2.
(c) N(N+2).
(d) (N+1)(N+2).
(e) (N â€“ 2)^2.
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15 Aug 2005, 11:33
a) (N+2)^2.
(b) N^2+2.
(c) N(N+2).
(d) (N+1)(N+2).
(e) (N â€“ 2)^2.

well n be odd I PICK 7 another d
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15 Aug 2005, 13:33
they all are even...

if we take Vaslids approach then...D is clear

(N+1)(N+2)=even

N+1 has to be even....N+2 has to be odd...even*odd=even...always...
15 Aug 2005, 13:33
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