Q. 6 C

# An urn contains 9

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

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