If the rth term is the middle term in the expansion of (x^2- 1 2x )^ 20 then the (r+3)th term is

JEE Advanced Mathematics question

If the th term is the middle term in the expansion of then the th term is

Answer: (C)

Index 20 ⇒ 21 terms; the middle term is the 11th, so and we need (i.e. in ):

={}^{20}C_{1

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Question ID VK-108328