Posted by shree on Thursday, November 19, 2009 at 11:49am.
Three coins are tossed. Find the probability that no more than one coin lands heads up.

math  Reiny, Thursday, November 19, 2009 at 12:20pm
so you want 0 heads or 1 head
ttt > 1 way
tth
tht
htt > 3 ways
so prob(of stated event) = 4/8 = 1/2