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sandy

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Joined: 07 Jun 2014

Posts: 4805

GRE 1: Q167 V156

WE:Business Development (Energy and Utilities)

Which expression is equivalent to [#permalink]

03 Apr 2017, 03:01

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Question Stats:

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41% (01:11) wrong

based on 17 sessions

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Which expression is equivalent to $\frac{1}{y - (1 \div y)}-y$?

A. $\frac{y^3 + y -1}{y^2 -1}$

B. $\frac{2y - y^3}{y^2 -1}$

C. $\frac{-y^3}{y^2 -1}$

D. $y^3 + y -1$

E. $- y -1$

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sandy

Retired Moderator

Joined: 07 Jun 2014

Posts: 4805

GRE 1: Q167 V156

WE:Business Development (Energy and Utilities)

Re: Which expression is equivalent to [#permalink]

03 Apr 2017, 05:24

Expert Reply

Explanation

This is a good problem for Plugging In. If y = 2, then the expression becomes equal to − $\frac{4}{3}$. Choice B is the only choice that gives you − when you replace y with 2.

Hence option B is correct.
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