<PRE><B>Question 1109916</B>
 A box contains 4 red, 7 blue and 6 white balls. 
If a ball is chosen at random,
a. what is the probability that it is not red?:: (7+6)/(7+6+4) = 13/17
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b. what is the probability to draw 3 balls of different colors?
# of sets of 3 balls:: 17C3
# of sets with 3 balls of different colors:: 1
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Ans 1/(17C3) = (1*2*3)/(17*16*15) = 0.0015..
Cheers,
Stan H.
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