Q: What is the sum of all factors of the number 99 excluding 99?

 A: 57

Why is 57 the sum of all factors of 99, excluding 99?

The factors of the number 99 are: 1, 3, 9, 11, 33, 99.

If you add them up, you will get the total of 156. Now subtract 99 to get 57


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