Basic Theorems of Probability

A silver dollar is flipped twice. Calculate the probability of each of the following occurring:

a) a head on the first flip

b) a tail on the second flip given that the first toss was a head

c) two tails

d) a tail on the first and a head on the second

e) a tail on the first and a head on the second or a head on the first and a tail on the second

f) at least one head on the two flips