Question

2. A bag contains 5 black, 7 red and 3 white balls. Aball is drawn from the bag at
random. Find the probability that the ball drawn is(i) red (ii) black or white (iii) not
biack. (2)​

Answer 1

Total no. of balls in the bag is 15 (7 red, 5 black and 3 white)

Step-by-step explanation:

No. of red balls in bag is 7

Therefore, 7C1( Selecting 1 out of 7 items) times out of 15C1( Selecting 1 out of 15 items) a red ball is picked.

Let E be the event of drawing a red ball from bag

We know that, Probability P(E) =(Total no.of possible outcomes)(No.of favorable outcomes)=15C17C1=157

Solution(ii):

No. of black or white balls in bag is 8 (5 black and 3 white)

Therefore, 8C1( Selecting 1 out of 8 items) times out of 15C1( Selecting 1 out of 15 items) a black or white ball is picked.

Let E be the event of drawing a black or white ball from bag

We know that, Probability P(E) =(Total no.of possible outcomes)(No.of favorable outcomes)=15C18C1=158

Solution(iii):

No. of non-black balls in bag is 10 (7 red and 3 white)

Therefore, 1

Answer 2

Answer:

red = 7/15 , black or white = 8/15;

, not black = 2/3