Math: Permutations and Combinations
posted by Dee .
Need a verification:
Combinations of n items taken r at a time: C9n,r)= n!/(nr)!*r!
C(8,0)
8!/(80)!*(0)! = 8!/8!*0! = 0 or Answer is 0 or 1?

The formula is correct, noting the parentheses, i.e.
C(n,r) = n!/((nr)!r!)
Since 0!=1, the expression
8!/((80)!*(0)!) = 1