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# If xy = 1 and x is not equal to y, then what is the value of 7^(1/x-y)

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Intern
Joined: 07 Dec 2016
Posts: 41
If xy = 1 and x is not equal to y, then what is the value of 7^(1/x-y) [#permalink]

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12 Sep 2017, 09:19
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Difficulty:

25% (medium)

Question Stats:

69% (05:14) correct 31% (00:44) wrong based on 32 sessions

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If xy = 1 and x is not equal to y, then what is the value of $$(7 ^{(\frac{1}{x-y})})^{(\frac{1}{x}- \frac{1}{y})}$$?

A. $$\frac{1}{49}$$

B. $$\frac{1}{7}$$

C. 1

D. 7

E. 49
[Reveal] Spoiler: OA

Last edited by Bunuel on 30 Sep 2017, 04:41, edited 1 time in total.
Edited the question.
Manager
Joined: 12 Feb 2017
Posts: 71
Re: If xy = 1 and x is not equal to y, then what is the value of 7^(1/x-y) [#permalink]

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12 Sep 2017, 09:43
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Re: If xy = 1 and x is not equal to y, then what is the value of 7^(1/x-y)   [#permalink] 12 Sep 2017, 09:43
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