Question

Three fair coins are tossed. What is the probability that at least one is a tail? (Enter the probability as a fraction.)

Answer 1

1/3?

Answer 2

If you flip a coin three times, how many different outcomes can happen? (i.e. HHH, TTT, HTH, etc,)

Answer 3

Prob of atleast 1, meaning 1 and 2 and 3 tails= 1-prob of no tails

Answer 4

Prob of all heads = (1/2)^3
Hence Prob of atleast 1 tail
= 1-(1/2)^3 = 7/8

Answer 5

ok thanks,