did i solve this correctly?

Question

You can flip a coin three times.

a) what is the probability of getting heads on only one of your flips?

b) what is the probability of getting heads on at least one flip?

 

So this is how i got my answers for a and b.

 

A = 1/4

B = 3/4

 

tails, tails, tails

tails, tails, heads

tails, heads, heads

heads, heads, heads

 

 

Answer 1

flip a coin 3 times

the sample space is...

 

HHH

THH

HTH

HHT

THT

TTH

HTT

TTT

 

a) 3/8

b) 7/8