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ineuqalities

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Shrutikanda
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ineuqalities [#permalink] New post   10 Jun 2010, 17:49
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A
B
C
D
E

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20% (00:40) correct 80% (00:38) wrong based on 11 sessions
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Please explain following question .

If u is positive number, then which of the following could be negative number?
1. u^7-u^6
2.U^3+U^4+U^5
3.U^-9
4.U^-13+U^13
5. U^3 - U^8

Ans. is 5 .



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Re: ineuqalities [#permalink] New post   10 Jun 2010, 22:14
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The "could be" language makes me doubt this as a GMAT-like question. "Must be" is much more the GMAT's style.

With "could be," either A or E would work.

(A) u^7-u^6 = u^6 (u - 1) = pos (pos -1). That (pos -1) could be pos or negative, based on the constraint that u = "a positive number." For example, if u = 0.5, then (u-1) = negative, but if u = 2, then (u-1) = positive.

(E) u^3-u^8 = u^3 (1 - u^5) = pos (1 - pos). Similar reasoning to that for (A). If u = 0.5, then (1 - u^5) = positive, but if u = 2, then (1 - u^5) = negative.
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Re: ineuqalities [#permalink] New post   11 Jun 2010, 12:32
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Absolutely, any positive number < 1 would make choice A an answer as well.

Thanks
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Re: ineuqalities [#permalink] New post   11 Jun 2010, 13:40
iambroke wrote:
Absolutely, any positive number < 1 would make choice A an answer as well.

Thanks



Right , i think i got the idea. just wondering from where i can practice these kind of questions?
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Re: ineuqalities [#permalink] New post   11 Jun 2010, 14:04
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Shrutikanda wrote:
iambroke wrote:
Absolutely, any positive number < 1 would make choice A an answer as well.

Thanks



Right , i think i got the idea. just wondering from where i can practice these kind of questions?


Buy OG12, OG quant.

Other good resources are GMATCLUB tests, MGMAT tests. Gmatprep tests.



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Re: ineuqalities [#permalink]
11 Jun 2010, 14:04
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