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Prove that there is no term involving x^...

Prove that there is no term involving `x^(6)` is the expansion of `(2x^(2) - 3/x)^(11)`.

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`T_(r+1)= (-1)^(r) *.^(11)C_(r)(2x^(2)) ^((11-r)) * (3/x)^(r) = (-1)^(r)*^(11)C_(r)2^((11-r))xx3^(r)*x^(22-3r)`
`22 - 3r = 6 rArr 3r = 16 rArr r = 16/3,` which is a fraction.
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