Question

Suppose you have a bag that contains 2 black and 8 striped marbles. You select one marble, replace it, and then select another. Find the probability that you will select two black marbles in a row.

P(black & black) =

Answer 1

2/10 (1/5)

Explanation:

to do this, you know that the marble is put back, so you have an equal chance each time. then, find how many black marbles there are, and go from there.