probability white ball or even number

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shobha.r.iyer: Junior | Next Rank: 30 Posts; Posts: 11; Joined: Wed Jan 07, 2009 4:32 pm

by shobha.r.iyer » Fri Jan 09, 2009 9:58 am

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Source: Beat The GMAT — Data Sufficiency | Fri Jan 09, 2009 9:58 am

logitech: Legendary Member; Posts: 2134; Joined: Mon Oct 20, 2008 11:26 pmFollowed by: 25 members; Thanked: 237 times; GMAT Score:730

by logitech » Fri Jan 09, 2009 1:01 pm

We are trying to find

W/25 + Even/25 - White Even/25

ST1) White Even/25 = 0

INSUF

ST2) W/25-Even/25 = 0.2

INSUF

together still insuf

E

LGTCH
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"

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aj5105: Legendary Member; Posts: 1169; Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member; Thanked: 25 times

by aj5105 » Fri Jan 09, 2009 6:59 pm

P(white or even) = P(white) + P(even) - P(white and even)

E

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