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If X is a prime number, what is the value of X? (1) X <

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If X is a prime number, what is the value of X? (1) X < [#permalink] New post 18 Jun 2005, 10:39
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A
B
C
D
E

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If X is a prime number, what is the value of X?

(1) X < 15

(2) (X-2) is a multiple of 5.

I chose C. Seems like you can narrow X down to equal 7.

???

Answer is E.
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 [#permalink] New post 19 Jun 2005, 15:32
I also found that both statement separately were insufficient
but how did you come TO E
can you explain ?

thanks :)

i
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 [#permalink] New post 19 Jun 2005, 15:38
(1) alone is insufficient, obviously. So scratch out A and D

(2) alone is insufficient because you can have 17 and 7 (17-2 = 15 and 7-2=5). So scratch out B also

Together it ould appear to be sufficient but remember that 0 is also a a multiple of 5. So you can have X=2 or X=7 both fulfilling the 2 conditions. Scratch out C

Answer is E
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 [#permalink] New post 20 Jun 2005, 09:28
tbetten wrote:
So 0 is a prime number??


Based on Statement 1 & 2: X can be 2 or 7, so E
'0' is not a prime number. A prime number has to have 2 factors 1 and itself.
  [#permalink] 20 Jun 2005, 09:28
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