SOLUTION: ncr +2�ncr-1+ncr-2 =n+2cr

Question 1045421: ncr +2�ncr-1+ncr-2 =n+2cr
Found 2 solutions by robertb, ikleyn:
Answer by robertb(5830)   (Show Source): You can put this solution on YOUR website!
To prove: .

We make use of the Pascal's Triangle: .
===>
=
=
= ,
=
Answer by ikleyn(52781)   (Show Source): You can put this solution on YOUR website!
.
On Pascal's triangle see the lesson
    - The Pascal's triangle
in this site.

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