Question

suppose that you have a black box, with certain red balls and white balls. draw a ball from the box, write down the color, and put it back. try this for n times, and we get m red balls.

Answer 1

If a bag contains white, black and red balls only and the probability of getting a white ball is 3/10 and the probability of a black ball is 2/5 then the probability of getting red balls is 3/10.

Given that a bag contains white, black and red balls only and the probability of getting a white ball is 3/10 and the probability of a black ball is 2/5.

We are required to find the probability of getting red balls.

Probability=Number of items/Total items

Probability of getting red balls=1-(Probability of getting white balls +Probability of getting black balls)

=1-(3/10+2/5)

=1-7/10

=3/10

Hence if a bag contains white, black and red balls only and the probability of getting a white ball is 3/10 and the probability of a black ball is 2/5 then the probability of getting red balls is 3/10.

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