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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

Re: Is rst = 1? 1) rs = 1 2) st = 1 [#permalink]
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.

Re: Is rst = 1? 1) rs = 1 2) st = 1 [#permalink]
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 _________________