Is r < 1?

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swerve: Legendary Member; Posts: 2539; Joined: Sun Oct 29, 2017 2:04 pmFollowed by: 6 members

by swerve » Tue Oct 31, 2017 9:10 am

$$Is\ r<1?$$

$$(1)\ r>0$$
$$(2)\ r^2<1$$

The OA is B.

I need help with this DS question. Please, can any expert assist me with it? Thanks.

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Source: Beat The GMAT — Data Sufficiency | Tue Oct 31, 2017 9:10 am

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Jay@ManhattanReview: GMAT Instructor; Posts: 3008; Joined: Mon Aug 22, 2016 6:19 amFollowed by: 34 members; Location: Grand Central / New York; Thanked: 470 times

by Jay@ManhattanReview » Fri Nov 10, 2017 12:38 am

swerve wrote:$$Is\ r<1?$$
$$(1)\ r>0$$
$$(2)\ r^2<1$$
The OA is B.

I need help with this DS question. Please, can any expert assist me with it? Thanks.

(1) r > 0.

If say r = 1/2, the answer is Yes; however, if say r = 2, the answer is No. No unique answer. insufficient.

(2) r^2 < 1

=> -1 < r < 1

The answer is Yes. Sufficient.

The correct answer: B

Hope this helps!

-Jay
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