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" "Does the exparsion of "(2x^(2)-(1)/(x))^(20)" contain any term involving "x^(9)" ? "

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Does the expansion of (2x^(2)-(1)/(x))^(20) contain any term involving x^(9)?

Does the expansion of (2x^2-1/x)^(20) contain any term involving x^9?

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In the expansion of (x^((2)/(3))-(1)/(sqrt(x)))^(20),a term containing the power x^(13) .

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If the expansion of (x - (1)/(x^(2)))^(2n) contains a term independent of x, then n is a multiple of 2.

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No. of terms in the expansion of (1+2x)^(9) +(1-2x)^(9) is :