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If (2/3)^n=(3/2)^2, what is the value of n?

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If (2/3)^n=(3/2)^2, what is the value of n? [#permalink] New post 16 Jun 2012, 19:47
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

84% (01:30) correct 16% (00:23) wrong based on 83 sessions
If (2/3)^n=(3/2)^2, what is the value of n?

A. -2
B. -1
C. 0
D. 1
E. 2
[Reveal] Spoiler: OA
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Re: If (2/3)^n=(3/2)^2, what is the value of n? [#permalink] New post 16 Jun 2012, 20:16
I was surprised to see this question in the 600-700 range. It's just testing the basic exponent property involving a negative sign.

(n)^-1 = (1/n)
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Re: If (2/3)^n=(3/2)^2, what is the value of n? [#permalink] New post 17 Jun 2012, 01:58
Expert's post
Edited the difficulty tag of this question.

jsphcal wrote:
If (2/3)^n=(3/2)^2, what is the value of n?

A. -2
B. -1
C. 0
D. 1
E. 2



Since (\frac{3}{2})^2=(\frac{2}{3})^{-2} then we have that (\frac{2}{3})^n=(\frac{2}{3})^{-2} --> n=-2.

Answer: A.

For more on number theory and exponents check: math-number-theory-88376.html

DS questions on exponents: search.php?search_id=tag&tag_id=39
PS questions on exponents: search.php?search_id=tag&tag_id=60

Tough and tricky DS exponents and roots questions with detailed solutions: tough-and-tricky-exponents-and-roots-questions-125967.html
Tough and tricky PS exponents and roots questions with detailed solutions: tough-and-tricky-exponents-and-roots-questions-125956.html

Hope it helps.
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Re: If (2/3)^n=(3/2)^2, what is the value of n? [#permalink] New post 17 Jun 2012, 09:14
Answer: A

A negative exponent in a fraction leads to the reciprocal of the fraction. Thus the negative exponent of 2 is -2, allowing (2/3)^(-2) = (3/2)^2.
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Re: If (2/3)^n=(3/2)^2, what is the value of n? [#permalink] New post 27 Feb 2014, 19:58
(2/3)^n = (3/2)^2
= (2/3)^-2

n = -2 (Answer = A)
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Re: If (2/3)^n=(3/2)^2, what is the value of n?   [#permalink] 27 Feb 2014, 19:58
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