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S is the set of all fractions defined by the formula n/(n + 1), where

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S is the set of all fractions defined by the formula n/(n + 1), where [#permalink]

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New post 04 Jun 2011, 04:26
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E

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  25% (medium)

Question Stats:

69% (00:48) correct 31% (00:29) wrong based on 42 sessions

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S is the set of all fractions defined by the formula n/(n + 1), where n is a positive integer less than 20. What is the product of all the fractions that are in S?

1) 1/20
2) 1/21
3) 1/2
4) 19/40
5) 19/20
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Re: S is the set of all fractions defined by the formula n/(n + 1), where [#permalink]

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New post 04 Jun 2011, 04:32
1
1/2 * 2/3 * 3/4 * ... 19/20

= 1/20

Answer - A
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Re: S is the set of all fractions defined by the formula n/(n + 1), where [#permalink]

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New post 16 Sep 2017, 09:37
\(S = { \frac{n}{n+1} }\)

n= 1,2.... 19 <20

\(S= {\frac{1}{2}, \frac{2}{3}, ...... , \frac{18}{19} , \frac{19}{20}}\)

\(Product = \frac{1}{2}*\frac{2}{3}* ...... *\frac{18}{19}*\frac{19}{20} = \frac{1}{20}\)

Answer: A
Re: S is the set of all fractions defined by the formula n/(n + 1), where   [#permalink] 16 Sep 2017, 09:37
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S is the set of all fractions defined by the formula n/(n + 1), where

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