Summation of Combinations

Algebra Level 4

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.


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