For b, I have T2 = { 1 when n= 0, T2(n/2) otherwise} but I don't know how to get a summation for the first one.

(a) Construct a mathematical function T, (n) modeling the approximate worst-case runtime of the mystery1 method. Your answer should be written as a summation. You do not need to find the closed form of this summation. public static int mystery1 (int n) C int out0; for (int i 0in; i++) ( for (int j = 0; j