1. In the global sum problem that we discussed in class (slides 30 to 37 in lecture 1), if we assume that there is a variable called my rank (local to each core) that gives each core a unique rank from 0 to p-1 (for p cores), devise an expression to calculate my first_i and my_last i assuming: a. n is divisible by p and n>p b. n is not divisible by p. 1. In the global sum problem that we discussed in class (slides 30 to 37 in lecture 1), if we assume that there is a variable called my rank (local to each core) that gives each core a unique rank from 0 to p-1 (for p cores), devise an expression to calculate my first_i and my_last i assuming: a. n is divisible by p and n>p b. n is not divisible by p