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

Originally Posted by Mukilab 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. It's a geometric series with and common ratio . The sum of a finite geometric series can be evaluated using .

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