Question

A box contains 4 white, 3 black and 5 red marbles . a marble is drawn at random what is the probability that is a) red? b) white? c) not black?​

Answer 1

Step-by-step explanation:

(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

Answer 2

Answer:

Red=5/12

Step-by-step explanation:

white=4/12

black=3/12