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SVP
Joined: 05 Apr 2005
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N is a prime number bigger than 5. Which of the following [#permalink]
 14 Aug 2005, 20:46
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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 – 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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Manager
Joined: 14 Jul 2005
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Location: Sofia, Bulgaria
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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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Manager
Joined: 28 Jun 2005
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D is my answer assuming the choices read
a) (N+2)^2.
(b) N^2+2.
(c) N(N+2).
(d) (N+1)(N+2).
(e) (N – 2)^2.
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Senior Manager
Joined: 30 May 2005
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a) (N+2)^2.
(b) N^2+2.
(c) N(N+2).
(d) (N+1)(N+2).
(e) (N – 2)^2.
well n be odd I PICK 7 another d
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Current Student
Joined: 28 Dec 2004
Posts: 3439
Location: New York City
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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...
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