Proof without Words: 1+2+...+(n-1)=n Choose 2
![]() "Proof without Words: 1+2+...+(n-1)=n Choose 2" from The Wolfram Demonstrations Project http://demonstrations.wolfram.com/ProofWithoutWords12N1NChoose2/ Contributed by: Bruce Torrence | ||||||||||||||
![]() | ||
|
|
||
|
|||||||||||||||||||||
Note: To run this Demonstration you need the free
Mathematica Player or Mathematica 7+ |