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Is X prime? (1) X is a perfect square (2) X^2 is a perfect

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SVP
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Is X prime? (1) X is a perfect square (2) X^2 is a perfect [#permalink] New post 11 Jul 2004, 23:34
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Is X prime?

(1) X is a perfect square
(2) X^2 is a perfect square
Senior Manager
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 [#permalink] New post 11 Jul 2004, 23:49
E (not enough info from both)

x can be 4 or 16.
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 [#permalink] New post 12 Jul 2004, 00:43
A.

1) X can not be a prime.

2) X could be prime, or any other integer.
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 [#permalink] New post 12 Jul 2004, 03:53
the ans is ...

A ...

statement one: X is a perfect square... which means that X has a number lets suppose 'y' that multiplied into itself will give rasie to X

ex ---- > y * y= X, y=2 so , 2*2=4=X...now X can never be a prime 'cos it does have another integer which can divide X apart from X and the number 1 ( which is the sloe requisite of a prime number !)

sufficient

B-> says X ^2 is a prime number and now we got all the number s which fulfill this nescessity...we got 2 to satisfy this condition as well 4 too... which is not a prime whereas the number 2 is . not sufficient

Have fun :)
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 [#permalink] New post 16 Jul 2004, 23:06
enigmatic007 wrote:
the ans is ...

A ...

statement one: X is a perfect square... which means that X has a number lets suppose 'y' that multiplied into itself will give rasie to X

ex ---- > y * y= X, y=2 so , 2*2=4=X...now X can never be a prime 'cos it does have another integer which can divide X apart from X and the number 1 ( which is the sloe requisite of a prime number !)

sufficient

B-> says X ^2 is a prime number and now we got all the number s which fulfill this nescessity...we got 2 to satisfy this condition as well 4 too... which is not a prime whereas the number 2 is . not sufficient

Have fun :)



Good explination, But the woridng are so tricky that you woudl jump to E suddenly, need to hold the cluch before changign the gears
  [#permalink] 16 Jul 2004, 23:06
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Is X prime? (1) X is a perfect square (2) X^2 is a perfect

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