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Find the (n+1)th term from the end in ...

Find the (n+1)th term from the end in
the expansion of `(2x - (1)/(x))^(3n)`

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(n+1)th term from the end in the expansion of `(2x - (1)/(x))^(2n)`
= (n+1)th term from beginning in the expansion of
` (-(1)/(x) + 2x)^(2n)`
`= T_(n+1) = ""^(3n)C_(n) (-(1)/(x))^(3n-n) (2x)^(n) = ""^(2n)C_(n) *2^(n) * x^(-n) `
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