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Sub 505 Level|   Algebra|         
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GMATBusters
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What is the value of n? (1) n^(1/2) = 2 (2) (4n)^(1/2) = 4 01 Nov 2018, 07:54
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D
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5% (low)

Question Stats:

94% (00:26) correct 6% (00:37) wrong based on 205 sessions

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What is the value of n?


(1) \(\sqrt{n} = 2\)

(2) \(\sqrt{4n} = 4\)
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D
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pentium
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What is the value of n? (1) n^(1/2) = 2 (2) (4n)^(1/2) = 4 04 Nov 2018, 03:18
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Squaring both statement will fetch n=4 hence D
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What is the value of n? (1) n^(1/2) = 2 (2) (4n)^(1/2) = 4 04 Nov 2018, 07:31
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The answer is D.
We can solve this logically, without any calculation: both statements present an equation with one variable - a solution is definitely possible. they are both sufficient!

If we want to go the Precise route, and actually calculate, we can:

gmatbusters

(1) \(\sqrt{n}\) = 2
We'll raise both sides to the power of 2: n = 4 - that's our answer. Sufficient! B, C and E are eliminated!

gmatbusters

(2) \(\sqrt{4n}\) = 4
We'll raise both sides to the power of 2: 4n = 16 ==> n = 4 - that's our answer. Sufficient! A is eliminated. Answer D.
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What is the value of n? (1) n^(1/2) = 2 (2) (4n)^(1/2) = 4 10 Nov 2018, 23:13
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gmatbusters
What is the value of n?


(1) \(\sqrt{n}\) = 2

(2) \(\sqrt{4n}\) = 4


Statement 1: squaring both sides, we get n=4. Sufficient.
Statement 2: squaring both sides, we again get n=4. Sufficient.

D is the answer
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What is the value of n? (1) n^(1/2) = 2 (2) (4n)^(1/2) = 4 16 Nov 2018, 10:57
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gmatbusters
What is the value of n?


(1) \(\sqrt{n}\) = 2

(2) \(\sqrt{4n}\) = 4


we are looking for the value of n.

statement 1: \(\sqrt{n}\) = 2 = n = 4. Sufficient. to get the value of n , square both sides of the equation.

Statement 2: \(\sqrt{4n}\) = 4 = n=4. The same as 1.

D is the correct answer.
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