Question

A box contains four red, five blue and six green balls.If three balls are drawn at random, what is the probability that all the balls are of is the probability that all the balls are of different colors? Answer

Answer 1

$( \binom{4}{1} + \binom{6}{1} + \binom{5}{1} ) \div \binom{15}{3 } = 15 \div 546$
0.02747