Ben
ips a fair coin repeatedly. Given that Ben's first coin
ip is heads, compute the probability
Ben
ips two heads in a row before Ben
ips two tails in a row.	Choose the correct answer:
A) 2/3	B) 3/3	C) 1/3	D) 1/1	E) 2/2
If Ben successfully   ips two heads in a row, then Ben must have   ipped the coin an   even number of times. If Ben successfully   ips two tails in a row, then he must have   ipped   the coin an odd number of times. However, the coin must have been   ipped at least twice. The   desired probability is therefore   (1/3)/(1/2)=2/3   correct answer 2/3
<result>A</result>
Ben
ips a fair coin repeatedly. Given that Ben's first coin
ip is heads, compute the probability
Ben
ips two heads in a row before Ben
ips two tails in a row.