orangle marbles = 1
white marbles = 6
yellow marbles = 7
Total marbles = 1 +6 + 7 = 14
Probability of not getting a yellow = orange+ white / total = 1 + 6 / 14 = 7/14 = 1/2
Probability of not getting a orange = white + yellow / total = 6 +7 /14 = 13/14
probability of not getting a yellow and then not getting a
orange = 1/2 * 13/14 = 13/28
