# A coin is flipped twice.What is the probability that both flips result in heads given that first ...

A coin is flipped twice.What is the probability that both flips result in heads given that first flip does?

## Answer/Solution

1/2

### Steps/Work

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

Answer is option A

B=Second flips is head.

P(b|a)=n(a intersection b)/n(a)

=P(h,h)/P[(h,h),(h,t)]

=1/2

Answer is option A