Bridgewater, NJ 08807
Physics PhD, NSF-GRFP/NDSEG Fellow, NCI PSOC Young Investigator
...Traditionally, combinatorics are taught by repeating a long list of examples involving socks, keys on a keyring, etc. I know an alternative presentation that quickly demonstrates why (L+N)!/(L!N!) is the number of combinations of ways to draw L of L+N things....