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Find the middle term in the expansion of : `(a/x+\ b x)^(12)`

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The number of terms in the expansion of `((a)/(x) + bx)^(12) "in" = 13 `
(odd), its middle terms is `((12)/(2) + 1)` th. i.e. 7th term
` therefore ` Required terms , ` T_(7) = t_(6-1) =""^(12)C_(6+1) = ""^(12)C_(6) ((a)/(x))^(6) (bx)^(6)`
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