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sorry not much of a math guy but what does the c mean and what do the commas signify in the equation you gave?
9*6/C(50,2) - C(9,2)/C(50,4) =~ 21.8-to-1
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I recommend jay_shark's answer for you. [img]/images/graemlins/smile.gif[/img] The exact solution is seldom necessary.
Otherwise see
C(x,y) or xCy