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# What is the value of R? 1. R^R = R 2.

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What is the value of R? 1. R^R = R 2. [#permalink]  05 Mar 2008, 16:46
What is the value of R?

1. $R^R = R$
2. $(\frac{1}{R})^R = R$
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Re: Maths: What is the value of R? [#permalink]  05 Mar 2008, 16:57
Statement 1:
R^R = R => R^R-1 = 1 => (R-1) log R = 0 => (R-1) = 1 or R = 1

Statement 2:
1 = R^(R+1) => (R+1) log R = 0 => R = -1

Director
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Re: Maths: What is the value of R? [#permalink]  05 Mar 2008, 17:00
Should be 'E'

Stmt1: Possible values of R = 0,1,-1
Insuff

Stmt2: Possible values of R = 1,-1
Insuff

Taking them together: R =1,-1
Still Insuff
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Re: Maths: What is the value of R? [#permalink]  05 Mar 2008, 17:06
suntaurian wrote:
What is the value of R?

1. $R^R = R$
2. $(\frac{1}{R})^R = R$

i think R can be -1 or 1.

what is the OA?
Senior Manager
Joined: 06 Jul 2006
Posts: 295
Location: SFO Bay Area
Schools: Berkeley Haas
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Re: Maths: What is the value of R? [#permalink]  05 Mar 2008, 21:32
OA is E.

R can be both 1 and -1.
Re: Maths: What is the value of R?   [#permalink] 05 Mar 2008, 21:32
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Given a text passage, determine:
    1. If it contains a mathematical question (including word problems or calculations)
    2. If an answer to that mathematical question is provided in the text

First, describe the content structure you found in 1-2 sentences.

Then provide your analysis in the following format:
TYPE: <one of the following values>
- NO_QUESTION
- SINGLE_QUESTION
- SINGLE_QUESTION_WITH_ANSWER
- MULTIPLE_QUESTIONS
- MULTIPLE_QUESTIONS_WITH_ANSWERS
system
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# What is the value of R? 1. R^R = R 2.

Author Message
TAGS:
Senior Manager
Joined: 06 Jul 2006
Posts: 295
Location: SFO Bay Area
Schools: Berkeley Haas
Followers: 2

Kudos [?]: 35 [0], given: 0

What is the value of R? 1. R^R = R 2. [#permalink]  05 Mar 2008, 16:46
What is the value of R?

1. $R^R = R$
2. $(\frac{1}{R})^R = R$
Director
Joined: 10 Sep 2007
Posts: 949
Followers: 7

Kudos [?]: 205 [0], given: 0

Re: Maths: What is the value of R? [#permalink]  05 Mar 2008, 16:57
Statement 1:
R^R = R => R^R-1 = 1 => (R-1) log R = 0 => (R-1) = 1 or R = 1

Statement 2:
1 = R^(R+1) => (R+1) log R = 0 => R = -1

Director
Joined: 14 Jan 2007
Posts: 780
Followers: 2

Kudos [?]: 71 [0], given: 0

Re: Maths: What is the value of R? [#permalink]  05 Mar 2008, 17:00
Should be 'E'

Stmt1: Possible values of R = 0,1,-1
Insuff

Stmt2: Possible values of R = 1,-1
Insuff

Taking them together: R =1,-1
Still Insuff
Manager
Joined: 12 Feb 2008
Posts: 181
Followers: 1

Kudos [?]: 33 [0], given: 0

Re: Maths: What is the value of R? [#permalink]  05 Mar 2008, 17:06
suntaurian wrote:
What is the value of R?

1. $R^R = R$
2. $(\frac{1}{R})^R = R$

i think R can be -1 or 1.

what is the OA?
Senior Manager
Joined: 06 Jul 2006
Posts: 295
Location: SFO Bay Area
Schools: Berkeley Haas
Followers: 2

Kudos [?]: 35 [0], given: 0

Re: Maths: What is the value of R? [#permalink]  05 Mar 2008, 21:32
OA is E.

R can be both 1 and -1.
Re: Maths: What is the value of R?   [#permalink] 05 Mar 2008, 21:32
Similar topics Replies Last post
Similar
Topics:
1 Is 1/p > r/(r^2 +2) 19 05 Jul 2006, 20:38
16 Is 1/p > r/(r^2 + 2)? 20 01 Nov 2009, 15:06
What is the value of R? 1. R^R = R 2. (1/R)^R = R Can 9 08 Nov 2007, 03:34
is 1/p > r/(r^2+2) 6 04 Aug 2007, 06:25
Find an integer R. (1) (|R|)!=1 (2) |R|=R 9 13 May 2007, 20:39
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