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If 0 < x+1 < 1, which of the following lists is written

Expert replies
by Max@Math Revolution » Sun May 12, 2019 11:31 pm

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00:00

Answers

A

B

C

D

E

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Difficulty

[GMAT math practice question]

If 0 < x+1 < 1, which of the following lists is written in ascending order?

A. x, x^{-1}, x^2, 1, x^{-2}
B. x^{-2}, x, x^2, 1, x^{-1}
C. x^{-1}, x, x^2, 1, x^{-2}
D. x^{-1}, x^2, x, 1, x^{-2}
E. x^{-1}, x, x^2, x^{-2}, 1
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Source: — Problem Solving |

by Max@Math Revolution » Tue May 14, 2019 11:24 pm
=>

Plug in x = -1/2.
Then x^{-2} = 4, x^{-1}= -2 and x^2 = 1/4
Thus, x^{-1}< x < x^2 < 1 < x^{-2}.

Therefore, C is the answer.
Answer: C
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