Posted by F0reveryoung on Saturday, April 7, 2012 at 1:59pm.
total amount of balls = 15 red + 19 white = 34 balls
0 - 0/34 = 0
1 - 1/34
2 - 2/34 = 1/17
3 - 3/34
Prob red = 15/34
prob white = 19/34
when picking three:
prob(0 red) = C(3,0) (19/34)(18/33)(17/32) = 57/352
prob(1 red) = C(3,1) (15/34)(19/33)(18/32) = 2565/5984
prob(2red) = C(3,2) (15/34)(14/33)(19/32) = 1998/5984
prob (3red) = C(3,3)(15/34)(14/33)(13/32) = 455/5984
notice that the sum of the 4 fractions above is 5984/5984 = 1
the 2nd last prob calculation should be 1995/5984
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