Posted - 09/18/2008 : 11:00:59 the problem is : An unfair coin has 2/3 probability to turn out head. If it is tossed 50 times, what is the prbability that it will turn out head even # of times. This is my thinking it should turn out head 2/3(50) times. = 33.33 times of these even #s are 2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32 (16 ) Therefore the probability is 16/34 or 8/17. Am I right?