Question

A bag contains 5 red, 8 green and 7 white balls, One ball is drawn at random from the bag. What is the probability of getting a white ball or a green ball?

Answer 1

SOLUTION :  

GIVEN : Number of red balls  = 5

Number of green balls = 8

Number of white balls = 7

Total number of balls in a bag = 5 + 8 + 7 = 20

Total number of outcomes = 20

Let E = Event  of getting a white or a green ball  

Number of white or a green ball   = 8 + 7 = 15  

Number of outcome favourable to E = 15

Probability (E) = Number of favourable outcomes / Total number of outcomes

P(E) = 15/20 = 3/4

Hence, the required probability of getting a  white or a green ball , P(E) = 3/4

HOPE THIS ANSWER WILL HELP  YOU….

Answer 2

total number of ball = 5 + 8 + 7 = 20
probability of getting green ball is = total number of green ball / total number of ball = 8 / 20 = 2/ 5
probability of getting white ball is = total number of white ball/ total number of balls = 7/20