0.71 is read "seventy-one hundredths".
So, you put 71 over 100.

71 is prime, so no simplification can be done.
Please, Karla, explain what "C" and "n" represent. Are you talking about combinations (for example, n+2 objects taken n at a time? Or is C some kind of function? I don't quite see the relationship of this problem to 'data management.'