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Find the coefficient of x^4 in the expan...

Find the coefficient of `x^4` in the expansion of `(1+x+x^2+x^3)^(11)dot`

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To find the coefficient of \( x^4 \) in the expansion of \( (1 + x + x^2 + x^3)^{11} \), we can follow these steps: ### Step 1: Rewrite the expression We start with the expression: \[ (1 + x + x^2 + x^3)^{11} \] This can be rewritten using the formula for the sum of a geometric series. The expression \( 1 + x + x^2 + x^3 \) can be factored as: ...
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