114k views
4 votes
Alejandra's DVD movie collection includes 4 horror selections, 4 science fiction, 3 drama, 3 thrillers, and 2 comedies. If she picks two DVD's for an evening, without replacing them, what is the probability she will pick two thriller selections?

User Evalarezo
by
7.8k points

1 Answer

3 votes

\displaystyle |\Omega|=\binom{16}{2}=(16!)/(2!14!)=(15\cdot16)/(2)=120\\ |A|=\binom{3}{2}=(3!)/(2!)=3\\\\ P(A)=(3)/(120)=(1)/(40)=2,5\%
User Jack Vial
by
8.4k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.