flip a coin 3 times

Question

a) what are the odds in favor of getting exactly 2 heads
b) what are the odds against getting at most 1 tail

i got a) 3/4 b) 7/8
i don't think they are right can someone help

Answer 1

If you flip a coin 3 times, here are the possible combinations:

HHH
THH
HTH
HHT
HTT
THT
TTH
TTT

Only 3 of the 8 possibilities will have exactly 2 heads.

The odds against getting at most 1 tail are the same as getting no tails. You are right with that answer.

I hope this helps. Thanks for asking.