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is integer P positive? (1) sqrt P = P^2 (2) =1

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is integer P positive? (1) sqrt P = P^2 (2) =1 [#permalink] New post 15 May 2003, 06:40
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is integer P positive?

(1) sqrt P = P^2
(2) [P]=1
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 [#permalink] New post 15 May 2003, 09:43
Since the GMAT doesn't cover complex numbers (i.e. square roots of negatives) isn't the answer simply A?
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 [#permalink] New post 15 May 2003, 12:12
1. though u dont take negative square roots, from one u get P= 0 or 1.
1 is positve but 0 is neither positive nor negative - so u cant say

2. |P|=1 from this P can be 1(positive) or -1(negative)

from 1 & 2 P=1
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 [#permalink] New post 15 May 2003, 12:14
kdog3490 wrote:
Since the GMAT doesn't cover complex numbers (i.e. square roots of negatives) isn't the answer simply A?


Oops...forget about 0. Sorry....
  [#permalink] 15 May 2003, 12:14
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