A spinner is divided into a red half and a blue half. Let's use R to denote when the spinner lands on red and B to denote when the spinner lands on blue. If we spin the spinner three times, there are eight equally likely outcomes: S = {RRR, RRB, RBR, BRR, BBR, BRB, RBB, BBB}

a) If the spinner is spun three times, find the probability it lands on red exactly two times.

b) If the spinner is spun three times, find the probability it lands on blue every time.

c) If the spinner is spun three times, find the probability it lands on red at least once.

d) If the spinner is spun three times, find the probability it lands on blue four times.

e) If the spinner is spun three times, find the probability it lands on red fewer than five times.