Answer :

We know that,


Probability of occurrence of an event


By permutation and combination, total no.of ways to pick r objects from given n objects is nCr


Now, total no.of ways to pick a ball from 20 balls is 20c1 = 20


Our desired output is to pick a white or red ball. So, no.of ways to pick a white or red ball from 16 balls(because there are a total of 16 balls which are either red or white) is 16c1 = 16


Therefore, the probability of picking a white or red ball



Conclusion: Probability of picking a white or red ball from 9 red, 7 white, and 4 black balls is


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
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
RELATED QUESTIONS :

Four candidates AMathematics - Exemplar

If A and B are muMathematics - Exemplar

State whethMathematics - Exemplar

If P (A ∪</Mathematics - Exemplar

State whethMathematics - Exemplar

If A and B are muMathematics - Exemplar

The probability tRS Aggarwal - Mathematics

In a town of 6000RS Aggarwal - Mathematics