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PUNE MCA Exam 2017 Question Paper with answers for online practice

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Question : 25

Total: 41

The number of ways of electing n things from 3n things of which n are one kind and alike, and n are of second kind and alike and rest are unlike is;

(n+2)2n−1
(
3n
n
)
(
3n
n
)−(
2n
n
)
3n

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