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

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

03 Oct 2008, 12:27

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

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Re: power [#permalink]

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!!

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Re: power [#permalink]

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)

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Re: power [#permalink]

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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Re: power [#permalink]

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.
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Re: power [#permalink]

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

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

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