Question

22. A box contains 3 blue, 2 white and 4 red marbles. If a marble is drawn at random from the box, what is the probability that it will be. (i) white? (ii) blue? (iii) red?​

Answer 1

Answer:

(a) Total no. of marbles=3+2+4=9

(1) No. of white marbles=2

∴ probability of getting a white marble=

9

2

(2) No. of blue marbles=3

∴ probability of getting a blue marble=

9

3

=

3

1

(3) No. of red marbles=4

∴ probability of getting a red marble=

9

4

(b)Since, Total no. of balls = 5+8+7=20

(1) No. of balls that are white or green = 8+7=15

∴ probability of getting a white or green ball =

20

15

=

4

3

(2) No. of balls that are neither green nor red =7

∴ probability of getting a ball that are neither green nor red =

20

7