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How to calculate the probability statistics of high school mathematics as C3 1 and so on. I don't know how to calculate. Although I know the formula, I still can't use it.
Please watch that Cnm is Anm/Ann. This is the formula. For example, C3 1 is A3 1=3 A33=3*2* 1.

So A3 1/A33 is 3/6= 1/2 OK, okay?

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