A bag contains 10white and 3 black balls. Balls are drawn one by one without replacement till all black are drawnend fins the probability that this procedure comes to an end at the 6th draw
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Step-by-step explanation:
10/13×9/12×8/11×3/10×2/9×1/8
assume that first 3 are white and next three black order doesnt matter
when u take 1 denominator decreases and numerator also decreases
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