- #1
lifeonfire
- 14
- 0
Homework Statement
To Prove:
(nC0)(mC0) + (nC1)(mC1) + ... + (nCm)(mCm) = (n+m C m)
where nC0 = n choose 0 and so on.
Homework Equations
The Attempt at a Solution
Tried expanding the whole thing using factorials - but didn't work. Any hints would be really welcome!