Mary has 3 red marbles and 7 yellow marbles in a bag. If she were to remove 2 red and 1 yellow marbles and set them aside, what is the probability of her pulling a yellow marble as her next marble?

Cameron has 3 red marbles and 7 yellow marbles in a bag. If he were to pull a single red marble out and set it aside, which is the probability that he will select a red marble from the bag?

Mary has 3 red marbles and 7 yellow marbles in a bag. If she were to pull two marbles out of the bag one at a time (without replacement), what is the probability that both are red?