Summation of Combinations
Consider the multiplication of any two distinct integers chosen from 1 to 100 inclusive. Define set \(S\) denote the set which contains all such numbers (not necessarily distinct).
What is the sum of all the numbers in set \(S\)?
Details and Assumptions:
Order is irrelevant, \((1,4)\) and \((4,1)\) count as \(1\) combination. Also, the integers chosen within a pair have to be unequal.
You might want to use a calculator as the calculation is large.