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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 14 Feb 2005, 13:54
if x is a prime number, what is the value of x?

(1) x < 15
(2) (x-2) is a multiple of 5

Answer is (E), but why?

isn't the answer (C)? and x = 7?

THe answer says that 0 is also a multiple of 5, so chose (C) will still not work. But are they saying that 0 is a prime number??!? :shock:

Please advise

Many thanks
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 [#permalink] New post 14 Feb 2005, 14:00
nevermind... I was stupid...
(2-2)=0 which is multiple of 5

and 2 is a prime number. :lol:
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 [#permalink] New post 14 Feb 2005, 18:31
1) x is less than 15, so could be 2,3,5,7,11,13 (Not sufficient)
2) (x-2)= 5n (n=1,2,3,4,5 etc)
x could be for instance 2, 7 or 17. So not sufficient.

Using both,
Same logic, x=2 works, x=7 works too.
  [#permalink] 14 Feb 2005, 18:31
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