The professor gave us this geometric sum equation:

Sum from k=0 to n of p[sup:1ljuawnd]k[/sup:1ljuawnd] = [1 - p[sup:1ljuawnd]n+1[/sup:1ljuawnd]] / [1 - p]

Apparently, I need to get my sum into that form. Also, how do you generally change the limits of summation? I haven't played with this stuff in years. I'm ashamed.

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