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Summation formula help

  • Thread starter amaresh92
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  • #1
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whats the summation of a^n for a>1 over summation n=0 to N
thanks.
 

Answers and Replies

  • #2
606
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whats the summation of a^n for a>1 over summation n=0 to N
thanks.
Hint: for [itex]\,r\neq 1\,[/itex] a constant, we have

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

DonAntonio
 
  • #3
Simon Bridge
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Homework Helper
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This is the sort of thing most people just look that up - do you need to work out the formula or what?
 

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