Hi this question was in Advanced Higher Maths in the UK
Show that (n+1 , 3) - (n ,3 )=(n ,2)
They are written in column vector form ie n+1 at top and 3 at the bottom for example for the first. I think you have to use the n c r formula to prove the rhs
hi again the following link takes you to the question http://i223.photobucket.com/albums/d...f/HPIM0534.jpg
Hi, I understand that Pascal's rule is involved but I'm not sure how to go about the proof. The link to the question no 5 is at the following link http://i223.photobucket.com/albums/d...f/HPIM0534.jpg. It just seems to easy to simplify and make r =3.