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[" 22.The coefficient of "x^(n)" in the ...

[" 22.The coefficient of "x^(n)" in the expansion of "(1+(x)/(1!)+(1)/(2!)x^(2)cdots+(1)/(n!)x^(n))^(2)],[[" 1) "2^(n)," (2) "(2^(n))/(n)," 3) "n!," 4) "(1)/(n!)]]

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