bag 1 : 4 white marbles, 2 black marbles....total of 6 marbles....probability of first marble picked being white is : 4/6 reduces to 2/3
bag 2 : 3 white marbles, 5 black marbles...total of 8 marbles...probability of second marble picked being white is : 3/8
probability of both marbles being white is : 2/3 * 3/8 = 6/24 reduces to 1/4 <==
