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Question

The middle term in the expansion of (1+x)2n is:


A

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B

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C

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D

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Solution

The correct option is B


Middle term

= Tn+1 = 2nCn = 1.2.3.......(2n1)2nn!xn

= 1.3.5......(2n1)n!×2n(1.2.3..........n)n!xn

= 1.3.5.........(2n1)n! 2nxn.


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