#1408 · Algebra · Sequences & series

Coefficient of x to the r

If $x^{r}$ occurs in the expansion of $(x + \frac{1}{x})^{n}$ , find its coefficient.

~8 minAnswer checked instantlybinomial theoremcombinatorial coefficients

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XIII. Binomial Theorem: Positive Integral Index, Examples XIII.a, No. 33

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).