Question

In a box, there are red, black and yellow marbles. The number of marbles which are not

red is 12. The number of marbles which are not yellow is 9 and the number of marbles

which are not black is 11. A marble is taken out of the box at random. What is the

probability that the marble is of black colour.​

Answer 1

Answer:

5/16

Step-by-step explanation:

yellow +black =12

red +black= 9

yellow + red = 11

yellow + black = 12 so, 12/3 = 4 red

red + black = 9 so, 9-4 = 5 = black

red + yellow = 11 so, 11-4 = 7= yellow

so the probability of black is 5/16.