A bag contains 3 red, 2 white and 4 green balls. What is the probability of drawing the second ball to be green if the first ball drawn is red? The balls are not replaced in the bag.

Category: QuestionsA bag contains 3 red, 2 white and 4 green balls. What is the probability of drawing the second ball to be green if the first ball drawn is red? The balls are not replaced in the bag.
Editor">Editor Staff asked 11 months ago

A bag contains 3 red, 2 white and 4 green balls. What is the probability of drawing the second ball to be green if the first ball drawn is red? The balls are not replaced in the bag.
 
(a) 0.82
 
(b) 0.91
 
(c) 1.23
 
(d) 0.5
 
I got this question in unit test.
 
My enquiry is from Multiplication Theorem on Probability topic in division Probability of Mathematics – Class 12
NCERT Solutions for Subject Clas 12 Math Select the correct answer from above options 
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1 Answers
Editor">Editor Staff answered 11 months ago

Correct answer is (d) 0.5
 
To explain I would say: Total number of balls = 9
 
The probability of the first ball to be red = \frac {3}{9}
 
The probability of the second ball to be green without replacement = \frac {4}{8} = \frac {1}{2} = 0.5