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Is r/s^2 a terminating decimal?

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Is r/s^2 a terminating decimal? [#permalink]

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New post 12 Jan 2010, 04:27
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A
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D
E

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Is \(\frac{r}{s^2}\) a terminating decimal?

(1) \(s = 225\)
(2) \(r = 81\)
[Reveal] Spoiler: OA
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Re: Is r/s^2 a terminating decimal? [#permalink]

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New post 12 Jan 2010, 05:30
C

factors of 225 square;
(5,5,5,5,3,3,3,3)
If the numerator is a multiple of 81, fraction is terminating. Else, it is non terminating.

combining statement 1 and statement 2, r/square(s) is terminating. Hence c
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Re: Is r/s^2 a terminating decimal? [#permalink]

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New post 15 Jan 2010, 02:11
the square of any number ending with 5, also has 5 as its unit digit. and if the unit digit of the denominator is 5 the fraction always yields a terminating decimal number. but here as the number has three as its factor the above law is not applicable


OA is C:evil:
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Re: Is r/s^2 a terminating decimal? [#permalink]

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New post 15 Jan 2010, 02:15
dradbeee wrote:
sorry,
the square of any number ending with 5, also has 5 as its unit digit. and if the unit digit of the denominator is 5 the fraction always yields a terminating decimal number.


OA is a :evil:

i m sorry friend.... u r forgetting 225 has 9 as a factor and 9 leaves a terminating decimal?.. no way unless it gets cancelled by numerator :twisted:
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Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Re: Is r/s^2 a terminating decimal?   [#permalink] 15 Jan 2010, 02:15
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