-A coin is weighted so that it comes up heads 80% of the time. You bet $1 that you can make it come up tails 3 times in 3 flips.
--Is this problem binomial, geometric, or neither
--What is the probability that you will win the bet?
--To make the bet fair, how much should I pay you if you win?
The Practice of Statistics, First Edition.
Yates, Moore, McCabe