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WHy not C?

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Source: — Data Sufficiency |
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by erdnah » Fri Aug 24, 2007 12:48 am
1) not suff
2) not suff
= a, b, d eliminated

r=s=t=1 => rst = 1
r= 1/3, s = 3, t = 1/3 => rst = 1/3

so: e
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