Question

a fair coin is tossed until for the first time the same result appears twice in succession(i.e until the TT or HH).Describe the sample space and assign probabilities that reflects the fairness of the coin..find the probabilities of the events
A="The coin is tossed at most five time"
B="the total number of tossed is odd'"
C=AUB
D= A(intersection)B