- #1

- 148

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[tex]\sum_{n=2}^{\infty} \begin{pmatrix}

{n}\\

{2}

\end{pmatrix} z^{n}[/tex]

{n}\\

{2}

\end{pmatrix} z^{n}[/tex]

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- Thread starter geft
- Start date

- #1

- 148

- 0

[tex]\sum_{n=2}^{\infty} \begin{pmatrix}

{n}\\

{2}

\end{pmatrix} z^{n}[/tex]

{n}\\

{2}

\end{pmatrix} z^{n}[/tex]

- #2

Office_Shredder

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Which part is confusing you?

- #3

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It's supposed to be a power series, but I don't understand how to decipher the brackets.

- #4

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[tex]\binom{n}{k}=\frac{n!}{k!(n-k)!}[/tex]

See http://en.wikipedia.org/wiki/Binomial_coefficient

- #5

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Many thanks!

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