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The coefficient of the term independent ...

The coefficient of the term independent of `x` in the expansion of `(a x+b/x)^(14)` is `14 ! a^7b^7` b. `(14 !)/(7!)a^7b^7` c. `(14 !)/((7!)^2)a^7b^7` d. `(14 !)/((7!)^3)a^7b^7`

A

`.^(14)C_(5)a^(9)b^(5)`

B

`.^(14)C_(6)a^(8)b^(6)`

C

`.^(14)C_(7)a^(7)b^(7)`

D

`.^(14)C_(8)a^(6)b^(8)`

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