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What is the value of 5^r? (1) 4^r = 64 (2) r^4 = 81 I would

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What is the value of 5^r? (1) 4^r = 64 (2) r^4 = 81 I would [#permalink] New post 19 Dec 2004, 17:58
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2. What is the value of 5^r?
(1) 4^r = 64
(2) r^4 = 81

I would like to know the rule that would be applied to answer the question stem regarding the use of a variable as the base and using the variable as an exponent.
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 [#permalink] New post 21 Dec 2004, 13:32
answer A 5^3=125
(1) r=3 Suff
(2) r=+/-3 Insuff
  [#permalink] 21 Dec 2004, 13:32
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What is the value of 5^r? (1) 4^r = 64 (2) r^4 = 81 I would

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