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If r and p are two different prime numbers, which of the

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If r and p are two different prime numbers, which of the [#permalink] New post 07 Jun 2008, 15:31
If r and p are two different prime numbers, which of the following is the smallest possible value of r + p?
a)1
b)3
c)5
d)8
e)10
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Re: Prime numbers [#permalink] New post 07 Jun 2008, 15:45
That's a really easy one.

Start with the smallest two prime numbers : 2 and 3

well, here you go : 2 + 3 = 5
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Re: Prime numbers [#permalink] New post 07 Jun 2008, 15:48
Can't we consider negative numbers too?
Mishari wrote:
That's a really easy one.

Start with the smallest two prime numbers : 2 and 3

well, here you go : 2 + 3 = 5
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Re: Prime numbers [#permalink] New post 07 Jun 2008, 17:45
ldpedroso wrote:
Can't we consider negative numbers too


Read the question step...we are considering prime numbers....
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Re: Prime numbers [#permalink] New post 11 Jun 2008, 07:05
prime numbers are positive

i.e. -2 is not a prime number
Re: Prime numbers   [#permalink] 11 Jun 2008, 07:05
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