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The factors of 50 are 2 5 10 25 ...

The factors of 50 are 2 5 10 25 and 50, omitting one this sums to 2 + 5 + 1+ 7 + 5 which is 20. Where am I getting it wrong?

Created: Jan. 29, 2013, 2:26 p.m.
Updated: Sept. 30, 2013, 1:46 p.m.
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