Quantitative | Re: Number Theory

You're probably thinking of problems that ask you to factor a number like 20! + 12, or 11! + 7, etc. In general, there are a few rules that apply here:

- to factor a sum of two numbers, start by looking for factors they have in common. If a and b share a factor, then that number also factors into a+b.
- a factorial, like 20!, is a product of a whole
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