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by Night reader » Sat Jan 22, 2011 3:57 pm
GHong14 wrote:Image
4C2=4*3/2=6 <- total outcomes
favorable outcomes -> 1
P=1/6

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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.