Question 539643
A fair coin is flipped three times. Find the probability that it will come up heads at least twice?

--------
P(x = 2 or x = 3) = 3C2(1/2)^3 + 3C3(1/2)^3 = 3/8 + 1/8 = 4/8 = 1/2
=========
Cheers,
Stan H.