If a coin is tossed five times, find the probability that (a) The first toss matches the second toss. (b) We get five heads. (c) We get at least one result of tails. Solution a. first can match the second or cannot.. so the probability is 0.5 b. 5 heads is that, 0.55 c. at least one heads implies.. 1-probability of all tails =1-0.55.