Posted by Miri on Sunday, October 4, 2009 at 7:31pm.
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

Mathematics  bobpursley, Sunday, October 4, 2009 at 7:33pm
The possible outcomes were
HHt
Htt
ttt
So, the probability of at least one head is 2/3 
Mathematics  Jacob, Sunday, January 20, 2013 at 12:36pm
6/7 because 7/8 and 6/7