Solve :
$(1 + 3 x + 3 x^{2} + x^{3})^{20}$

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Solution

$(1 + 3 x + 3 x^{2} + x^{3})^{20}$
$= {[x^{3} + (1)^{3} + 3 x (x + 1)]}^{20}$
$= ((x + 1)^{3})^{20}$
$= (x + 1)^{60}$

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