User contributions
- 01:45, 30 November 2016 (diff | hist) . . (0) . . m Ball-and-urn (n is the number of bins, and k is the number of objects. For the second case, k >= n so it must be k - 1 choose n -1)
Sign In
Register
math training & tools
Alcumus
Videos
For the Win!
MATHCOUNTS Trainer
AoPS Practice Contests
AoPS Wiki
LaTeX TeXeR
MIT PRIMES/CrowdMath
Keep Learning
Sign In
Register
