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For which of the following expressions would the value be

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For which of the following expressions would the value be [#permalink]

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New post 01 Feb 2012, 20:05
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For which of the following expressions would the value be greater if 160 were replaced by 120 ?

A) 1000- 160

B) 160/(1+160)

C) 1/(1-1/160)

The answer choices are listed below

1) None
2) A only
3) C only
4) A & B
5) A & C

Could please provide a solution to this problem ?
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Re: For which of the following expressions would the value be gr [#permalink]

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New post 01 Feb 2012, 22:05
answer should be A & C

a) 1000-160 = 840 vs 1000-120 = 880 so it is higher

b) 160/161 is bigger than 120/121

c) 1/(1-1/160) vs 1/(1-1/120) you really dont need to work it out

you can compare the 1-1/160 vs the 1-1/120 the 1/120 will reduce it more than the 1/160 since its a larger number but it is at the bottom of a fraction so it will make the value bigger overall.
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Re: For which of the following expressions would the value be [#permalink]

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New post 03 Mar 2012, 01:47
I am getting "A only." Because doesn't 1/(1-1/160) put 0 in the denominator which cannot happen?
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Re: For which of the following expressions would the value be [#permalink]

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New post 03 Mar 2012, 01:52
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Re: For which of the following expressions would the value be [#permalink]

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New post 03 Mar 2012, 02:01
Oh ok. Thanks. I wasn't looking at it that way.
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Re: For which of the following expressions would the value be [#permalink]

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Re: For which of the following expressions would the value be   [#permalink] 16 Jun 2014, 03:01
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For which of the following expressions would the value be

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