Question

How many times must a man toss a fair coin, so that the probability of having at least one head is more than 80% ???????

Answer 1

man should throw at least two times to reach the probability of getting at least one head is more than 80℅

Answer 2

answer is more than 80 times because when it is tossed once head can come one time so if want 80 then we have to toss this much time