2. Re: General

What have you tried? Do you know the formula for a binomial coefficient?

$^nC_r = \frac{n!}{(n-r)!\ r!}$

3. Re: General

From what formula is it? Can't see it clearly.

4. Re: General

nCr=n!/((r!)(n-r!)) with this formula you can try it.

Thank you
Bizworldusa

5. Re: General

Thank you for the formula bizworldusa

_____________
walking bridges

6. Re: General

This formula is the basic formula of probability.It is used if we select some items out of many items.It means we are selecting r items out of n items.

7. Re: General

I think it would be like that :

nCr = n!/{(n-1)! r!}