If the square root of t is a real number, is the square root : GMAT Data Sufficiency (DS)
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# If the square root of t is a real number, is the square root

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If the square root of t is a real number, is the square root [#permalink]

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09 Apr 2013, 15:32
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85% (hard)

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32% (01:49) correct 68% (00:51) wrong based on 31 sessions

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If the square root of t is a real number, is the square root of t positive?

(1) t > 0
(2) t^2 > 0
[Reveal] Spoiler: OA

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Re: If the square root of t is a real number, is the square root [#permalink]

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10 Apr 2013, 00:12
Rock750 wrote:
If the square root of t is a real number, is the square root of t positive?

(1) t > 0
(2) t^2 > 0

I wouldn't worry about this question at all since it deals with a subtle difference between writing "the square root of t" and "$$\sqrt{t}$$". You won't see such question on the real test.
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Re: If the square root of t is a real number, is the square root [#permalink]

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10 Apr 2013, 00:26
1. t is positive. Square root of t can be either positive or negative. Not sufficient.
2.$$t^2$$ is positive and square root of t is a real number.So t should be positive and square root of t can be positive or negative.
Not sufficient.

Combining both statements,we can not proceed further.

Ans : Option E.
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If the square root of t is a real number, is the square root [#permalink]

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29 Nov 2014, 16:16
I saw this same question in a Mc Graw Hill book and still I do not fully understand, because Official Guide says that we must consider only the positive root.
Here is an explanation from Manhattan GMAT:
http://www.manhattanprep.com/gmat/blog/ ... -the-gmat/
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If the square root of t is a real number, is the square root   [#permalink] 29 Nov 2014, 16:16
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