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Re: QOTD#14 If w is a non-positive integer, which of the [#permalink]
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]
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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]
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Post A Detailed Correct Solution For The Above Questions And Get A Kudos.
Question From Our New Project: GRE Quant Challenge Questions Daily - NEW EDITION!
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Re: QOTD#14 If w is a non-positive integer, which of the [#permalink]
GreenlightTestPrep wrote:
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


Show: :: 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


Is this GRE specific and does this still apply? Because 0^0 yields 1 on calculators.
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Re: QOTD#14 If w is a non-positive integer, which of the [#permalink]
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pprakash786 wrote:
Is this GRE specific and does this still apply? Because 0^0 yields 1 on calculators.


From the Official Guide to the GRE General Test:
Image

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Re: QOTD#14 If w is a non-positive integer, which of the [#permalink]
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Option D works well, but 0 raised to 0 is not defined, and 0 is non positive number as it is non positive and non negative. This leaves us with only option E
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Re: QOTD#14 If w is a non-positive integer, which of the [#permalink]
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Re: QOTD#14 If w is a non-positive integer, which of the [#permalink]
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