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If in the expansion of (2a- a^2/4)^9 the...

If in the expansion of `(2a- a^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)`

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