The middle term in the expansion ,of x+12x2n is 

The middle term in the expansion ,of x+12x2n is 

  1. A

    135(2n3)n!

  2. B

    135(2n1)n!

  3. C

    135(2n+1)n!

  4. D

    None of the above

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    Solution:

    Given expression is x+12x2n

     Middle term =2nCn(x)n12xn=2n!n!n!2n=135(2n1)n!

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