Fill in the blanks to make the equation true. (Each blank should contain an integer.)
C(n,k) = ____ * C(n-2, k-2) + ______ * C(n-2, k-1) + ______ * C (n-2, k)
C(n,k) means "n choose k."
I know it has something to do with Pascal's triangle/identity but idk how to start :-(
