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Founder  Joined: 18 Apr 2015
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2^n + 2^n + 2^n + 2^n = 4^n+3 [#permalink]
Expert's post 00:00

Question Stats: 80% (00:44) correct 20% (02:45) wrong based on 20 sessions
$$2^n + 2^n + 2^n + 2^n = 4^{n+3}$$

 Quantity A Quantity B n 4

A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given
[Reveal] Spoiler: OA

_________________ GRE Instructor Joined: 10 Apr 2015
Posts: 1802
Followers: 58

Kudos [?]: 1686  , given: 8

Re: 2^n + 2^n + 2^n + 2^n = 4^n+3 [#permalink]
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Expert's post
Carcass wrote:
$$2^n + 2^n + 2^n + 2^n = 4^{n+3}$$

 Quantity A Quantity B n 4

A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given

--------ASIDE------------------------
Many students will fail to correctly simplify the terms on the left side of the given equation.
Notice that k + k + k + k = 4k
And x² + x² + x² + x² = 4x²
And 2m + 2m + 2m + 2m = 4(2m) = 8m
Likewise, $$2^n + 2^n + 2^n + 2^n = 4(2^n)$$
-----ONTO THE QUESTION!!---------------

GIVEN: $$2^n + 2^n + 2^n + 2^n = 4^{n+3}$$

Simplify left side: $$4(2^n) = 4^{n+3}$$

Rewrite both 4's as follows: $$(2^2)(2^n) = (2^2)^{n+3}$$

Simplify both sides: $$2^{2+n} = 2^{2n+6}$$

Since we now have the same base on each side, we can conclude that: $$2+n = 2n+6$$

Solve to get: $$n = -4$$

We have:
QUANTITY A: -4
QUANTITY B: 4

Answer: B

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Brent Hanneson – Creator of greenlighttestprep.com Sign up for my free GRE Question of the Day emails Re: 2^n + 2^n + 2^n + 2^n = 4^n+3   [#permalink] 03 Dec 2018, 10:31
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