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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

Kudos [?]: 9 [0], given: 74

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:

35% (medium)

Question Stats:

67% (06:47) correct 33% (00:55) wrong based on 24 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.

Kudos [?]: 9 [0], given: 74

Manager
Joined: 12 Feb 2017
Posts: 71

Kudos [?]: 21 [0], given: 40

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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Kudos if it helps.
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Kudos [?]: 21 [0], given: 40

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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