# Coefficient problem

• Jan 6th 2010, 01:14 AM
TomJerry
Coefficient problem
If any three successive coefficients in the expansion of $(1+x)^n$ are 36, 84 and 126. find n

I dont know how to begin this problem should i do a series of what ???
• Jan 6th 2010, 01:48 AM
Prove It
Quote:

Originally Posted by TomJerry
If any three successive coefficients in the expansion of $(1+x)^n$ are 36, 84 and 126. find n

I dont know how to begin this problem should i do a series of what ???

Draw Pascal's Triangle and see which row those three numbers appear in.