There are two bags containing white and black marbles. In the first bag there are 8 white marbles and 6 black marbles and in the second bag, there are 4 white marbles and 7 black marbles. One marble is drawn at random from any of these two bags. Find the probability of this marble being black.
A. 7/154
B. 22/77
C. 7/54
D. 41/77
Answer:D
There are two bags containing white and black marbles. In the first bag there are 8 white marbles and 6 black marbles and in the second bag, there are 4 white marbles and 7 black marbles. One marble is drawn at random from any of these two bags. Find the probability of this marble being black.
A. 7/154 B. 22/77 C. 7/54 D. 41/77