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If sum of middle terms is S in the expan...

If sum of middle terms is S in the expansion of `(2a-a^2/4)^9` then the value(s) of S is/are

A

`((63)/(32))a^(14)(8+a)`

B

`((63)/(32))a^(13)(8+a)`

C

`((63)/(32))a^(14)(8-a)`

D

`((63)/(32))a^(13)(8-a)`

Text Solution

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The correct Answer is:
D
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If in the expansion of (2a- ^2/4)^9 the sum of middle tem sis S, then the following is (are) thrue (A) S=(63/32)a^14(a+8) (B) S=(63/32)a^14(a-8) (C) S=(63/32)a^13(a-8) (D) S=(63/32)a^13(8-a)