The mean of the coefficients of $x,{x}^{2},\ldots \ldots {x}^{7}$ in the binomial expansion of $(2+x{)}^{9}$is_____ [JEE Main 2023, 11 Apr (Shift 1)]

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The mean of the coefficients of \(x,{x}^{2},\ldots \ldots {x}^{7}\) in the binomial expansion of \((2+x{)}^{9}\)is_____ …