Please use that technique.

4. Adapt the technique shown in class today to solve the following geometric sum. Notice that 500 the upper bound is not infinity: 10.3' i-1 7n 5. Now extend that approach to come up with a closed form for the following:> a1 3' i-1 0 (Get excited!) Let S (just so I don't have to keep writing that out ) i: 0 3 9 27 (all I did here was multiply by 1/3) 3 9 27 Let's do some subtraction (because we're fancy like that)! n So, our function is O(n), which 2 is a rather surprising result! Therefore: S= S(213)