Question

A bag contain 9 black ,7red,5 white ball. One ball is drawn at random from to box .find the probability getting a white or black ball

Answer 1

Answer:

let the number of balls in a bag be S .

total number of balls = 9 black + 7 red + 5 white ball

= 21 balls

S = {21}

n(S) = 21

A is the event of getting a white or a black ball

A = {5 white ,9 black}

n(A) = 14

P (A) = n(A)/n(S)

P(A)= 14/21

P(A) = 2/3