How would I find the sum of 3^r from r=1 to r=n?

I honestly have no workings because I don't know how to approach this since I can't split it into 3*(sum[1^r])

Thank you for your help.

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- Nov 18th 2012, 10:24 AMMukilabSum of 3^r
How would I find the sum of 3^r from r=1 to r=n?

I honestly have no workings because I don't know how to approach this since I can't split it into 3*(sum[1^r])

Thank you for your help. - Nov 18th 2012, 10:42 AMPlatoRe: Sum of 3^r
- Nov 18th 2012, 04:53 PMProve ItRe: Sum of 3^r