1.P(THH)? 2.P(exactly 2 tails)? 3.P(at most 1 tail)?

Question

Three fair coins are tossed: a penny, a dime, and a quarter. Find the sample space with all the outcomes equally likely. Then find each probability.
1.P(THH)?
2.P(exactly 2 tails)?

3.P(at most 1 tail)?

Answer 1

HHH

HHT

THH

HTH

TTT

TTH

HTT

THT

 

1) 1/8

2) 3/8

3) 4/8=1/2  (1 tail or less)