Q. 194.4( 14 Votes )

A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag.

Answer :

To Find: The number of blue balls


Given: Number of red balls = 5


P(blue) = 2 P(Red)


Concept Used:



Explanation:


Let the number of blue balls = x


Total number of balls = blue balls + red balls


Total balls = x + 5


The probability of drawing a red ball, P(Red)



The probability of drawing a blue ball, P(blue)



Now,




x = 10


Therefore, x = 1, as it cannot be negative.


Hence, the number of blue balls is 10.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Quiz | Imp. Qs. of ProbabilityQuiz | Imp. Qs. of ProbabilityQuiz | Imp. Qs. of Probability37 mins
Let's understand ProbabilityLet's understand ProbabilityLet's understand Probability40 mins
When Chance is called ProbabilityWhen Chance is called ProbabilityWhen Chance is called Probability48 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses