First slide
Introduction to probability

The probability that when 12 distinct balls are distributed among three boxes, the first will contain exactly three balls is


3 balls for 1st Box can be selected in  12C3 ways, remaining 9 balls can be placed in remaining 2 boxes in 29 ways.
Number of favourable cases =12C3×29

Total number of cases = 312

Required Probability = 12C3×29312= 12C3×2996

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