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GHong14: Master | Next Rank: 500 Posts; Posts: 155; Joined: Sat Oct 16, 2010 6:32 pm; Thanked: 3 times

by GHong14 » Sat Jan 22, 2011 3:38 pm

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Source: Beat The GMAT — Problem Solving | Sat Jan 22, 2011 3:38 pm

Night reader: Legendary Member; Posts: 1337; Joined: Sat Dec 27, 2008 6:29 pmFollowed by: 10 members; Thanked: 127 times

by Night reader » Sat Jan 22, 2011 3:57 pm

GHong14 wrote:

4C2=4*3/2=6 <- total outcomes
favorable outcomes -> 1
P=1/6

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hrkrishna: Newbie | Next Rank: 10 Posts; Posts: 8; Joined: Sat Jan 22, 2011 12:29 pm; Thanked: 1 times

by hrkrishna » Sat Jan 22, 2011 9:32 pm

Since 2 are selected from 4 the possibilities are 4C2 = 6

only X + Y, and X-Y product gives you the favorable out come of X^2 - (bY)^2.

So, the result is 1/6.

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