Find a nonzero integer R. (1) R^3=R^R (2) |R^R|=1 : GMAT Data Sufficiency (DS)
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# Find a nonzero integer R. (1) R^3=R^R (2) |R^R|=1

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Find a nonzero integer R. (1) R^3=R^R (2) |R^R|=1 [#permalink]

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13 Jul 2003, 06:59
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33% (00:00) correct 67% (01:09) wrong based on 3 sessions

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Find a nonzero integer R.

(1) R^3=R^R
(2) |R^R|=1
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Joined: 03 Jul 2003
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13 Jul 2003, 16:21
Your questions are too good! Keep it rolling !!

My Ans:
From 1: R = 3, 1, and тАУ1
From 2: R = 1, and тАУ1
From Both: R = 1 and тАУ1

Thus Ans: E
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20 Mar 2011, 02:38
From (1), the answer can be 3, 1 and -1

From (2), the answer can be -1 and 1

From (1) and (2), the answer can be -1 or 1, so the answer is E.
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20 Mar 2011, 06:38
subhashghosh wrote:
From (1), the answer can be 3, 1 and -1

From (2), the answer can be -1 and 1

From (1) and (2), the answer can be -1 or 1, so the answer is E.

is there Any algebraic approach to solve R^3=R^R to get 3, 1, -1?
R^3=R^R
Equating powers R=3
How to get 1 ,-1?
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20 Mar 2011, 06:47
You don't need algebra, it's obvious that for R^3=R^R:

3^3 = 3^3 (R = 3)

1^3 = 1^3

(-1)^3 = (-1) ^(-1) = 1/(-1) = -1
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Re: DS: OLD   [#permalink] 20 Mar 2011, 06:47
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