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Is rst = 1?

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Is rst = 1? [#permalink] New post 07 Nov 2005, 21:55
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Question Stats:

63% (01:47) correct 37% (00:30) wrong based on 83 sessions
Is rst = 1 ?

(1) rs = 1
(2) st = 1

OPEN DISCUSSION OF THIS QUESTION IS HERE: is-rst-90398.html
[Reveal] Spoiler: OA

Last edited by Bunuel on 07 Nov 2013, 01:08, edited 1 time in total.
Edited the question and added the OA
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 [#permalink] New post 07 Nov 2005, 22:19
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E.

Is rst = 1?

1) rs = 1
product of rs is given so rst depends on t Not Sufficient
cause let r =2 s =1/2 so rs =1 but do information about t ....so INSuff

2) st = 1
same explanation as 1 ...INSuff

taken togther also ...get differnt value
for example let r =2 , s=1/2, t =2 satisfy both condition but give answer NO
and r=1,s=1,t=1 satisfy both conditon bu gives answer Yes ...so Insuff

hence E
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 [#permalink] New post 07 Nov 2005, 22:21
Yes, if S is a fraction, then both statements are insuff.
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 [#permalink] New post 07 Nov 2005, 23:08
another number to pick in this case is:

r=s=t = -1
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 [#permalink] New post 08 Nov 2005, 18:27
OA is E and good explanation cool_jonny009.

Just posted the question so that members do not fall for the trap by not considering fractions or negative 1 (-1).
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Re: Is rst = 1? 1) rs = 1 2) st = 1 [#permalink] New post 06 Nov 2013, 09:50
One Q! When I was solving this question I thought that if there were 3 different letters then the 3 numbers should be different, but by the answers given to this question in this forum it seems that I was wrong. It looks as if even though we are given 3 different letters any of these could have the same value, can someone confirm this? I´ve tried looking "same letters" in the forum search but nothing came up, sorry if this was answered elsewhere.

Thanks in advance.
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Re: Is rst = 1? 1) rs = 1 2) st = 1 [#permalink] New post 07 Nov 2013, 01:10
Expert's post
cachaval wrote:
One Q! When I was solving this question I thought that if there were 3 different letters then the 3 numbers should be different, but by the answers given to this question in this forum it seems that I was wrong. It looks as if even though we are given 3 different letters any of these could have the same value, can someone confirm this? I´ve tried looking "same letters" in the forum search but nothing came up, sorry if this was answered elsewhere.

Thanks in advance.


Unless it is explicitly stated otherwise, different variables CAN represent the same number.

OPEN DISCUSSION OF THIS QUESTION IS HERE: is-rst-90398.html
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Re: Is rst = 1? 1) rs = 1 2) st = 1   [#permalink] 07 Nov 2013, 01:10
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