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 9 balls is 9c1 = 9


Our desired output is to pick a white ball. So, no.of ways to pick a white ball from 4 white balls (because the white ball can be picked from only white balls) is 4c1 = 4


Therefore, the probability of picking a white ball


Conclusion: Probability of picking a white ball from 4 white balls and 5 white balls is


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