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Evaluate the following: sum(n=1)^(11)(2+...

Evaluate the following: `sum_(n=1)^(11)(2+3^n)`

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`sum_(n=1)^(11)​(2+3^n)`
=`sum_(n=1)^(11)​2+sum_(n=1)^(11)3^n`
=`2×11+3(3^(11)−1​)/(3-1)`
=`22+3​(3^(11)−1)/2=265741.`
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