[" What is the coefficient of "x^(4)" in...

[" What is the coefficient of "x^(4)" in the expansion of "],[(1+2x+3x^(2)+4x^(3)...)^(1/2)],[[" (a) "1/4," (b) "1/16," tec "1+x^(2)y_(2)],[-5," (d) "1/128]]

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