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If the rth term is the middle term in th...

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

A

`20 C_(12).(1)/(2^(12)). x^(2) `

B

`-(1)/(2^(13)). 20 C_(7). x `

C

`20 C_(14).(1)/(2^(14)). x `

D

`20 C_(13).(1)/(2^(12)). x `

Text Solution

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The correct Answer is:
B
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