Online Course Discussion Forum

Problem 8.9 help on MC II-B Comb

 
 
Picture of Areteem Professor
Re: Problem 8.9 help on MC II-B Comb
by Areteem Professor - Monday, June 1, 2020, 10:57 AM
 

The question was supposed to say "$2$ red, $1$ green, and $1$ yellow", since we are picking $4$ balls total. Thus the answer would be $$\dfrac{\binom{6}{2} \binom{5}{1}\binom{4}{1}}{\binom{15}{4}}.$$