A box contains 3 red marbles, 4 green marbles, 7 blue marbles, 6 yellow marbles, 11 white marbles, 9 black marbles, and 10 gray marbles. Let E1 be the event of a red marble, E2 the green, E3 the blue, E4 the yellow, E5 the White, E6 the black, and E7 the gray marbles. Find the probability of the following:
