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**1. Homework Statement**

Expressing the binomial coefficients in terms of factorials and simplifying algebraically, show that

(n over r) = (n-r+1)/r (n over r-1);

**2. Homework Equations**

**3. The Attempt at a Solution**

I honestly don't even know how to come about this problem...I really need help in this subject. Even how to start it would be great.