Question 388294
The probability of getting 2 heads and two tails in a single toss of four unbiased/fair pennies, or the probability of winning this game, is {{{4C2*(1/2)^2(1/2)^2 = 6*(1/16) = 6/16 = 3/8}}}.  If someone played this game 80 times, the expectation is that he wins (3/8)*80 = 30 times.