Coefficient problem

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


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

Quote:

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Originally Posted by TomJerry

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


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

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