# Summation formula help

whats the summation of a^n for a>1 over summation n=0 to N
thanks.

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whats the summation of a^n for a>1 over summation n=0 to N
thanks.
Hint: for $\,r\neq 1\,$ a constant, we have

$$\sum_{n=0}^mr^n=\frac{r^{m+1}-1}{r-1}$$

DonAntonio

Simon Bridge