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[" (a) "1365" (b) "-1365" (c) "400" ,the...

[" (a) "1365" (b) "-1365" (c) "400" ,the expansion of "],[" (A) The coefficient of "x^(n)" in the "],[[" (1-9"x+20x^(2))^(-1)" is "," (b) "5^(n+1)-4^(n+1)],[" (a) "5^(n)-4^(n)," (a) "]]

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