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Suyog
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 Posted: Tue Oct 09, 2007 3:10 pm Post subject: Q'1 |
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Is the integer n even ?
(1) n^2 - 1 is odd.
(2) root n is an integer. |
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achandwa
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| Posted: Tue Oct 09, 2007 3:29 pm Post subject: |
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Answer is A.
i) n^2-1 is odd
This tells you that n is even, because if it were odd, its square would be odd too (odd*odd=odd) and n^2-1 would be even.
Sufficient.
ii) Root of n is integer
This doesn't tell you if n is even. For example, Root of 9 is 3 (an integer), Root of 4 is 2 (an integer) as well.
Insufficient |
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