If you are randomly sampling one at a time with replacement from a bag

If you are randomly sampling one at a time with replacement from a bag

If you are randomly sampling one at a time with replacement from a bag that contains eight blue marbles, seven red marbles, and five green marbles, what is the probability of obtaininga. a blue marble in one draw from the bag?b. three blue marbles in three draws from the bag?c. a red, a green, and a blue marble in that order in three draws from the bag?d. at least two red marbles in three draws from the bag?