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InterviewSolution
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There are 12 white and 12 red ball in a bag. Balls are drawn one by one with replacement from the bag. The probability that 7th drawn ball is 4th white, isA. `1//4`B. `5//32`C. `3//16`D. `5//16` |
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Answer» Correct Answer - B We have, `P=` Probability of getting a white ball in a draw `=1//2` `q=` Probability of getting a red ball in a draw `=1//2` Getting `4th` white ball in `7th` draw means that, we must get 3 white balls in the first six draws and a white ball in `7th` draw. `therefore` Required Probability `={.^6C_(3)((1)/(2))^3((1)/(2))^(6-3)}xx(1)/(2)=(5)/(32)` |
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