A jar of marbles contains the following: two purple marbles, four white marbles, three blue marbles, and two green marbles.What is the probability of selecting a blue marble from a jar of marbles?

A jar contains 4 red marbles, 3 white marbles, and 8 blue marbles. Two marbles are randomly selected from the jar with replacement. Find the following probabilities. Leave your answer as a reduced fraction. A red marble and then a blue marble is randomly selected. A white marble and then a red marble is randomly selected.

Inside a bag, there are 3 red, 4 green and 3 blue marbles. If you were to pick out two marbles without looking, what is the probability that neither of the selected marbles is blue?

Suppose a jar contains 6 red marbles and 29 blue marbles. If you reach in the jar and pull out 2 marbles at random without replacement, find the probability that both are red. Give your answer as a fraction or decimal out to at least 4 places.

An unknown number of marbles are placed into a bag. There are 16 blue marbles in the bag. We know that there is a Pr(Blue) = 2/5 ​ chance of drawing a blue marble. How many marbles are there in the bag?

Suppose a jar contains 20 red marbles and 37 blue marbles. If 2 marbles are randomly chosen from the jar at the same time, find the probability that both marbles are red. Round your answer to four decimal places.