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Q.

The number of ways of distributing 9 identical balls in 3 distinct boxes so that none of the boxes is empty is

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a

 8C3

b

28

c

38

d

5

answer is B.

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Detailed Solution

The problem m is equivalent to distributing 9 Identical things to 3 persons so that each person can get at least one thing i.e. Number of positive integral solutions x1+x2+x3=9⇒8C2=28

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