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ps - from OG11 #99

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Senior Manager
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ps - from OG11 #99 [#permalink] New post 13 Sep 2005, 16:00
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A
B
C
D
E

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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 at 3?
A) 5
B) 50
C) 10^5
D) 5^10
E) 8^10-3^10

Looking for a good explanation for this one.
Besides I think the OG is wrong in stating that 10^8 - 10^3 = 10^5.
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 [#permalink] New post 13 Sep 2005, 16:08
ans shud be C. 10 ^ 5.

this is geometric progression.
if a is first term and r is ratio, nth term is ar ^ (n - 1)

here r = 10

3rd term: a*10^2
8th term: a * 10^7

dividing, ratio is:
10 ^ 5
Senior Manager
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 [#permalink] New post 13 Sep 2005, 16:18
Thanks. That makes much more sense on how it is derived. What threw me off was the OG's explanation.
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  [#permalink] 13 Sep 2005, 16:18
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