Question

A bag contains 4 red marbles and 5 blue marbles. What is the probability of randomly selecting a blue marble and then, without replacing it, selecting a red marbleA bag contains 4 red marbles and 5 blue marbles. What is the probability of randomly selecting a blue marble and then, without replacing it, selecting a red marble

Answer 1

R means red marbles, B means blue marbles. Wish you can understand the meaning of this picture！(￣︶￣)

Answer 2

Answer: $\frac{5}{18}$

Step-by-step explanation:

P(blue) = 5 blue out of 9 total = $\frac{5}{9}$

P(red) = 4 red out of 8 remaining = $\frac{4}{8}$ = $\frac{1}{2}$  simplified

P(blue)    and     P(red)

      $\frac{5}{9}$      x        $\frac{1}{2}$

= $\frac{5}{18}$