Q. 305.0( 1 Vote )

# Mark the correct alternative in the following :If rth term is the middle term in the expansion of , then term isA. B. C. D. None of these

Given:  Total terms = n+1 = 21

Mid term = 21/2 = 11th term

For k= 10,it is rth term.

So (r+3)th term = 11th term

k=13

T14   = -20C13 x. 2 -13

= -20C7 x. 2 -13

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