Does the expansion of 2 x2-1-x20 contain any term involving x9 -

( 1)^r ^20C_r(2x^2)^20 r ( 1/x )^r x^40 2rx^ r=x^9 40 3r=9 31=3r r =31/3 r cannot be in fraction ∴ There is no term involving? ...

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Index of (r+1)th Term from End When Counted from Beginning

Does the expa...

Question

Does the expansion of ${(2 x^{2} - \frac{1}{x})}^{20}$ contain any term involving $x^{9} ?$

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(2 x^{2} - \frac{1}{x})

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