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If , then sum of series upto terms is
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Text solutionVerified
For
Thus, where
number of ways of selecting persons out of men and women
number of ways of selecting persons out of persons
Thus, where
number of ways of selecting persons out of men and women
number of ways of selecting persons out of persons
Hence, options and are correct.
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Question 1
Let be a positive integer . If the coefficient of 2nd,3rd,4th terms in the expansion of are in A.P., then find the value of .Stuck on the question or explanation?
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Question Text | If , then sum of series upto terms is |
Answer Type | Text solution:1 |
Upvotes | 150 |