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moneyman: Master | Next Rank: 500 Posts; Posts: 468; Joined: Sat Mar 03, 2007 10:17 pm; Thanked: 5 times

by moneyman » Thu Nov 20, 2008 4:54 am

Is it C ?

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Maxx

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Source: Beat The GMAT — Data Sufficiency | Thu Nov 20, 2008 4:54 am

Tryingmybest: Master | Next Rank: 500 Posts; Posts: 168; Joined: Thu Nov 13, 2008 4:34 am; Location: Pittsburgh; Thanked: 9 times

by Tryingmybest » Thu Nov 20, 2008 8:09 am

A and B alone are not sufficient.

A * B is positive means both A and B are of same sign.

++ or --

If the sum is positive then it is ++

SO C

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