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# if p and q are positive integers, what is the value of q? 1)

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Intern
Joined: 07 Sep 2008
Posts: 25
if p and q are positive integers, what is the value of q? 1) [#permalink]

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03 Oct 2008, 12:27
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if p and q are positive integers, what is the value of q?

1) q^p-1 =1
2) p=1

the answer is E, but why is not C?

both together, you've got q^1-1 =1 => q^0=1 => q=1
Manager
Joined: 12 Feb 2008
Posts: 176

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03 Oct 2008, 12:31
andreasonlinegr wrote:
if p and q are positive integers, what is the value of q?

1) q^p-1 =1
2) p=1

the answer is E, but why is not C?

both together, you've got q^1-1 =1 => q^0=1 => q=1

Q^0 is not defined. !
it should be E!!
Manager
Joined: 27 Sep 2008
Posts: 76

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03 Oct 2008, 13:39
I also get (C)

q^1 = 2

q = 2

Maybe you forgot () as in q^(p-1) ?

Then the answer is indeed (E)

SVP
Joined: 29 Aug 2007
Posts: 2453

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03 Oct 2008, 14:38
andreasonlinegr wrote:
if p and q are positive integers, what is the value of q?

1) q^p-1 =1
2) p=1

the answer is E, but why is not C?

both together, you've got q^1-1 =1 => q^0=1 => q=1

What is statement 1? Is it $$q^(p-1)$$ = 1" or "($$q^p$$) - 1 = 1"?
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SVP
Joined: 29 Aug 2007
Posts: 2453

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03 Oct 2008, 14:43
elmagnifico wrote:
andreasonlinegr wrote:
if p and q are positive integers, what is the value of q?

1) q^p-1 =1
2) p=1

the answer is E, but why is not C?

both together, you've got q^1-1 =1 => q^0=1 => q=1

Q^0 is not defined. !
it should be E!!

Q^0 is defined. Anything has 0 power is always 1.
_________________

Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html

GT

Intern
Joined: 07 Sep 2008
Posts: 25

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03 Oct 2008, 16:11
it's q^p-1=1 without parenthesis ()

You are right q is not defined, q could be 0, it could be 1, -1...
Re: power   [#permalink] 03 Oct 2008, 16:11
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# if p and q are positive integers, what is the value of q? 1)

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