Posted by austin on .
flip a coin 3 times
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

math 
PsyDAG,
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.