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rish: Senior | Next Rank: 100 Posts; Posts: 65; Joined: Fri Jul 24, 2009 11:47 am; Thanked: 5 times

by rish » Mon Sep 07, 2009 8:28 am

Plz explain your answer.

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Source: Beat The GMAT — Data Sufficiency | Mon Sep 07, 2009 8:28 am

JeffB: Master | Next Rank: 500 Posts; Posts: 153; Joined: Tue Jun 02, 2009 2:48 pm; Location: Ohio; Thanked: 16 times

hmm

by JeffB » Mon Sep 07, 2009 1:01 pm

I can't read it

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praky_rules: Senior | Next Rank: 100 Posts; Posts: 45; Joined: Wed Jun 11, 2008 4:25 pm; Thanked: 4 times; GMAT Score:730

by praky_rules » Wed Sep 09, 2009 4:05 pm

1 Xi=Xi-1 /2 does nt tell you what X1 is
2.X5=X4/(X4+1) - I hope I am reading this right...No good stand alone.

combining the two...X5=X4/2 so X4=0 or 1..but all Xi are positive numbers...so X4 = 1 and so X1 is known

C

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