WHy not C?

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tanyajoseph: Master | Next Rank: 500 Posts; Posts: 103; Joined: Wed May 30, 2007 6:17 am; Followed by:1 members

by tanyajoseph » Thu Aug 23, 2007 11:53 pm

Is rst = 1

1) rs = 1
2) st = 1

Source: Beat The GMAT — Data Sufficiency | Thu Aug 23, 2007 11:53 pm

erdnah: Senior | Next Rank: 100 Posts; Posts: 65; Joined: Tue Jun 12, 2007 12:57 am

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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