Question 925571
Look at the possible outcomes,
HHH
HHT
HTH
HTT
THH
THT
TTH
TTT
Now use this information to answer.
a) 1 for, 7 against so the odds are 7:1.
b) Same thing, 1 for, 7 against so the odds are 7:1.
c) 3 for, 5 against. Odds are 5:3.
d) 3 for, 5 against. Odds are 5:3. 
e) 7 for, 1 against. Odds are 7:1.