Some people believe that 13 is a bad luck number...and many people are afraid of number 13...but I can tell that 80% people of the world dont believe in that...its just a myth...a very popular myth...
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2xwhat= 26
Well, honey, the positive odd factors of 36 are 1, 3, and 9. Add those bad boys up and you get 13. So, the sum of the positive odd factors of 36 is 13. Hope that satisfies your math cravings, sweetie!
13 - (-13) = 13 + 13 = 26
13 - 13 = 0
91