A coin is flipped twice.What is the probability that both flips result in heads given that first flip does?	Choose the correct choice from the following options:	A) 1/2	B) 2	C) 1	D) 3/2	E) 1/3
A=First flip lands heads.   B=Second flips is head.   P(b|a)=n(a intersection b)/n(a)   =P(h,h)/P[(h,h),(h,t)]   =1/2   1/2nswer is option 1/2
<result>A</result>
A coin is flipped twice.What is the probability that both flips result in heads given that first flip does?