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If r and s are variables such that

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If r and s are variables such that  [#permalink]

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New post 02 Oct 2018, 18:24
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Question Stats:

19% (02:54) correct 81% (01:39) wrong based on 26 sessions

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If r and s are variables such that \(\frac{1}{r^2} − \frac{1}{s^2} > −9\) and \(\frac{2}{r^2} − \frac{2}{s^2} < 7\), which of the segments best represents the overlap zone for values of r and s?

A. \((-∞, \frac{−1}{4}), (\frac{1}{4}, ∞)\)

B. \((\frac{−1}{4}, \frac{1}{4})\)

C. \((-∞, \frac{−1}{5}), (\frac{1}{5}, ∞)\)

D. \((\frac{−1}{5}, \frac{1}{5})\)

E. \((-∞, \frac{−1}{5}), (\frac{1}{4}, ∞)\)

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Re: If r and s are variables such that  [#permalink]

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New post 07 Oct 2018, 06:09
Is this question correct? If so, may you please provide the solution
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Re: If r and s are variables such that  [#permalink]

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New post 10 Oct 2018, 18:37
workout wrote:
If r and s are variables such that \(\frac{1}{r^2} − \frac{1}{s^2} > −9\) and \(\frac{2}{r^2} − \frac{2}{s^2} < 7\), which of the segments best represents the overlap zone for values of r and s?

A. \((-∞, \frac{−1}{4}), (\frac{1}{4}, ∞)\)

B. \((\frac{−1}{4}, \frac{1}{4})\)

C. \((-∞, \frac{−1}{5}), (\frac{1}{5}, ∞)\)

D. \((\frac{−1}{5}, \frac{1}{5})\)

E. \((-∞, \frac{−1}{5}), (\frac{1}{4}, ∞)\)


What is meant by overlap zone here and how do we calculate it.Did not understand this question a bit.What should be done for such questions on test day.
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Re: If r and s are variables such that &nbs [#permalink] 10 Oct 2018, 18:37
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