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Q30 of 51 Page 18

Mark the correct alternative in the following :
If r^th term is the middle term in the expansion of , then term is

Given:

Total terms = n+1 = 21

Mid term = 21/2 = 11^th term

For k= 10,it is rth term.

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

k=13

T₁₄

= -²⁰C₁₃ x. 2 ^-13

= -²⁰C₇ x. 2 ^-13

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