Question

a plastic bag contains 5 marbles. two of the marbles are red and 3 of the marbles are blue. without looking, what is the probability of pulling out a blue marble and then another blue marble?(Assume that you don't put the first blue marble back in the bag) write your answer as a fraction.

Answer 1

$|\Omega|=5\cdot4=20\\|A|=3\cdot2=6\\\\P(A)=\dfrac{6}{20}=\dfrac{3}{10}$