If x is a positive integer, is x! + (x + 1) a prime number? : DS Archive
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# If x is a positive integer, is x! + (x + 1) a prime number?

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Manager
Joined: 19 Aug 2007
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If x is a positive integer, is x! + (x + 1) a prime number? [#permalink]

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30 Oct 2007, 09:28
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If x is a positive integer, is x! + (x + 1) a prime number?

(1) x < 10

(2) x is even
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Joined: 09 Aug 2006
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30 Oct 2007, 09:34
jimjohn wrote:
If x is a positive integer, is x! + (x + 1) a prime number?

(1) x < 10

(2) x is even

I'm getting B.

Stat 1: x = 2 or x = 6. Different answers. Insuff.

Stat 2: always getting a prime number when x is even. Suff.
Manager
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30 Oct 2007, 10:17
i dont have the OA for this one yet cuz im still in the middle of my test but i think its E because when x is 8 its not prime.
30 Oct 2007, 10:17
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# If x is a positive integer, is x! + (x + 1) a prime number?

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