11. Find the sum of the following series. Show all work, and give an exact answer (not an approximation). 13 + 3 + 3V/3 + 9 +9V3 +...+ 2187 12. Find the sum of all positive 3-digit numbers that are divisible by 13. Show all work to receive credit. 13. The sum of the first n terms of a series is S,, = n(n-1) + 4medicinebike (a) Find the terms t, t2, and t; (b) Also, find a formula for S, - Sum 3n2 - 2n 14. Find lim Show your work to receive credit. n ->con+ 100n TC On sin - n 2 15. Find lim Show your work to receive credit. n 4n' +16n 16. Find lim Show your work to receive credit. n- oo Von' + 64n2