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QOTD#14 If w is a non-positive integer, which of the

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QOTD#14 If w is a non-positive integer, which of the [#permalink] New post 16 Nov 2016, 13:16
Expert's post
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Question Stats:

17% (00:43) correct 82% (00:25) wrong based on 29 sessions
If w is a non-positive integer, which of the following must be positive?

Indicate all possible values.
A. −3w
B. 2w + 10
C. w^4
D. w^0
E. −w + 0.5

Drill 4
Question: 7
Page: 294


[Reveal] Spoiler: OA
E
[Reveal] Spoiler: OA
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Re: QOTD#14 If w is a non-positive integer, which of the [#permalink] New post 16 Nov 2016, 13:23
Expert's post
Explanation

Remember to Plug In multiple times for must be questions. First, use an easy number, such as −1, and try it in each choice. All of the answers are positive, so don’t eliminate anything. Can we eliminate anything by making w smaller? A number such as −10 will allow us to eliminate choice (B), but everything else is still positive. But can w = 0? Non-positive just means the number can’t be positive—it doesn’t mean it can’t be zero.






w = -1w = 0
3w30
2w+10810
w^410
w^011
-w+0.51.50.5


Hence options D and E are correct.

Note: Option B is negative if w is large enough.
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Re: QOTD#14 If w is a non-positive integer, which of the [#permalink] New post 02 Jan 2017, 17:08
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Expert's post
sandy wrote:
If w is a non-positive integer, which of the following must be positive?

Indicate all possible values.
A. −3w
B. 2w + 10
C. w^4
D. w^0
E. −w + 0.5

Drill 4
Question: 7
Page: 294


[Reveal] Spoiler: OA
D and E


There's a slight problem with answer choice D.
If we let w = 0 (a non-positive integer), then w^0 = 0^0 and 0^0 is not defined (see page 141 of the Official Guide to the GRE - 3rd edition)
If 0^0 is not defined, we cannot say that 0^0 is positive.

So, there's only answer correct answer: E

Cheers,
Brent
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Re: QOTD#14 If w is a non-positive integer, which of the [#permalink] New post 06 Oct 2018, 02:16
why not A and C ? Please elucidate.
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Re: QOTD#14 If w is a non-positive integer, which of the [#permalink] New post 06 Oct 2018, 06:31
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Aroma wrote:
why not A and C ? Please elucidate.


A and C both are not positive when w=0.
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Re: QOTD#14 If w is a non-positive integer, which of the   [#permalink] 06 Oct 2018, 06:31
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