Question
Find the values of the following expressions:
$\text{i}+\text{i}^{2}+\text{i}^{3}+\text{i}^{4}$
$\text{i}+\text{i}^{2}+\text{i}^{3}+\text{i}^{4}$
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$\frac{(2 n) !}{7 !(2 n-7) !}: \frac{n !}{4 !(n-4) !}=24: 1$