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

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SVP
Joined: 05 Apr 2005
Posts: 1708

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

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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 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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Manager
Joined: 14 Jul 2005
Posts: 104

Kudos [?]: 9 [0], given: 0

Location: Sofia, Bulgaria

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15 Aug 2005, 00:39
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.

Kudos [?]: 9 [0], given: 0

Manager
Joined: 28 Jun 2005
Posts: 212

Kudos [?]: 6 [0], given: 0

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15 Aug 2005, 06:12

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

Kudos [?]: 6 [0], given: 0

Senior Manager
Joined: 30 May 2005
Posts: 275

Kudos [?]: 44 [0], given: 0

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15 Aug 2005, 12:33
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

Kudos [?]: 44 [0], given: 0

Current Student
Joined: 28 Dec 2004
Posts: 3351

Kudos [?]: 319 [0], given: 2

Location: New York City
Schools: Wharton'11 HBS'12

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15 Aug 2005, 14:33
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...

Kudos [?]: 319 [0], given: 2

15 Aug 2005, 14:33
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