Eli has a jar full of marbles. In the jar there are 1818 blue​ marbles, 1010 red marbles and 1111 purple marbles.   a. She selects a marble at random from the jar. She does not replace the marble. She selects a second marble from the jar. What is the probability that the second marble is red given that the 1st marble was also​ red? What is the correct interpretation of this​ question?

There are 100 balls in a container. 30 of them are red, 50 blue, and 20 green.  We randomly select a ball, return it to the container and select another ball. What is the probability that both times balls are green? Write your answer as a decimal.

A chest of pirate treasure has 8 fake coins, 6 plastic jewels, 5 painted stink bombs, and 2 priceless artifacts. If a person randomly selects one item from the chest, what is the probability that they select a priceless artifact? Write your answer as a decimal and round to three decimal places.

A box has 20 green hats and 15 blue hats. If you pick 3 hats without replacement, what is the probability that you pick exactly 1 blue hats from the box?