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Rational Numbers

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Rational Numbers [#permalink] New post 07 Feb 2010, 23:16
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On a scale that measures the intensity of a certain phenomenon, a reading of n+1 corresponds to an intensity that is 10 times the intensity corresponding to a reading of n. On that scale, the intensity corresponding to a reading of 8 is how many times as great as the intensity corresponding to a reading of 3?

a) 5
b) 50
c) 10^5
d) 5^10
e) 8^10 - 3^10
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Re: Rational Numbers [#permalink] New post 08 Feb 2010, 00:16
for every +1 increse in scale, intensity increases by 10 times ... 8 is 3+5 .. so intensity is 10^5 times more

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Re: Rational Numbers [#permalink] New post 09 Feb 2010, 01:11
C

f(n+1)=10f(n)
f(n+2)=10f(n+1)=(10^2)f(n)
...

f(8)=f(3+5)=(10^5)f(3)
Re: Rational Numbers   [#permalink] 09 Feb 2010, 01:11
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