What is the coefficient of x in (x^4 + x^3 + x^2 + x + 1)^5?
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\( (x^4 + x^3 + x^2 + x + 1)^5=x^{20}+5x^{19}+15x^{18}+...+15x^2+{\color{blue}5x}+1\)
The coefficient of x is 5.
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