- #1
Proggy99
- 51
- 0
Homework Statement
By a combinatorial argument, prove that for r [tex]\leq[/tex] n and r [tex]\leq[/tex] m,
[tex](^{n+m}_{r})[/tex] = [tex](^{m}_{0})(^{n}_{r})[/tex] + [tex](^{m}_{1})(^{n}_{r-1})[/tex] + ... + [tex](^{m}_{r})(^{n}_{0})[/tex]
Homework Equations
The Attempt at a Solution
I need some direction on how to start this problem. It is the only homework problem I am not sure of how to approach it.