Question

One marble is randomly drawn and then replaced from a jar containing two white marbles and one

black marble. A second marble is drawn. What is the probability of drawing a white and then a
black?

Answer 1

1/3.

Explanation:

Prob(Drawing white marble) = 2/3

Prob(Drawing a black marble on second draw ) = 1/2

So:

Prob(Drawing a white then a red marble) = 2/3 * 1/2

= 2/6

= 1/3.