Mathematics
posted by Miri .
Three quarters are tossed, and a tail appears on at least one of them. What is the probability that at least one head appears? Express your answer as a common fraction.
I'm confused on this problem. I don't even know what the problem is asking. :D

The possible outcomes were
HHt
Htt
ttt
So, the probability of at least one head is 2/3 
6/7 because 7/8 and 6/7