Is rst = 1 ?
(1) rs = 1
(2) st = 1
E
DS
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Stmt I and Ii by itself is insufficient
Stmt I no info about t
Stmt II no info about r
Together
rs = 1
st = 1
rs * st = 1*1
rs^2t = 1
All three r,s and t could be 1
or
r=1 s=1/2 t=4
rs^2t = 1 but rst <> 1
E)
Stmt I no info about t
Stmt II no info about r
Together
rs = 1
st = 1
rs * st = 1*1
rs^2t = 1
All three r,s and t could be 1
or
r=1 s=1/2 t=4
rs^2t = 1 but rst <> 1
E)
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Cramya's solution is perfect, here is another way
Statement I & II insufficient without a doubt
Combining I & II
rs = 1
st = 1
r=1, s=1, t=1
rst = 1--------yes
r=-1, s=-1, t=-1
rst = -1-------no
Insufficient.
Hence E. I love to hate fractions
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- ronniecoleman
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YUP
IMO E
rs = 1
st =1
now from one rs =1 but nothing abut t so OUT
now from second st =1 nothing about r so OUT
Now from both
rsst = 1
s*s = 1/ rt
rst = 1/s
we don't know about s
so OUT
IMO E
rs = 1
st =1
now from one rs =1 but nothing abut t so OUT
now from second st =1 nothing about r so OUT
Now from both
rsst = 1
s*s = 1/ rt
rst = 1/s
we don't know about s
so OUT
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