[" 7.The coefficient of "x^(9)" in "(1+9...

[" 7.The coefficient of "x^(9)" in "(1+9x+27x^(2)+27x^(3))^(6)" is "],[[" 1) "^(18)C_(9),3^(9),2)^(18)C_(8)3^(9)," 3) "^(18)C_(10).3^(8)" 4) "^(8)C_(9)3^(7)]]

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