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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 a. `14 ! a^7b^7` b. `(14 !)/(7!)a^7b^7` c. `(14 !)/((7!)^2)a^7b^7` d. `(14 !)/((7!)^3)a^7b^7`

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