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Which one of these are prime numbers?

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Which one of these are prime numbers? [#permalink] New post 25 Jun 2013, 16:38
If x = 11!

then which of these are prime numbers?

X+2, x+3, x+5, x+7

Thanks
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Re: Which one of these are prime numbers? [#permalink] New post 25 Jun 2013, 20:32
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futurembaapplicant wrote:
If x = 11!

then which of these are prime numbers?

X+2, x+3, x+5, x+7

Thanks


None of these can be prime.

x = 11!. So x is a multiple of all numbers between 1 and 11 included.

x + 2 = multiple of 2 + multiple of 2 = multiple of 2
x + 3 = multiple of 3 + multiple of 3 = multiple of 3
x + 5 = multiple of 5 + multiple of 5 = multiple of 5
x + 7 = multiple of 7 + multiple of 7 = multiple of 7
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Re: Which one of these are prime numbers?   [#permalink] 25 Jun 2013, 20:32
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Which one of these are prime numbers?

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