Find the term independent of x in the expansion of :


To Find : term independent of x, i.e. x0


For


a=x, and N=3n


We have a formula,








Now, to get coefficient of term independent of xthat is coefficient of x0 we must have,


(x)3n-3r = x0


• 3n - 3r = 0


• 3r = 3n


• r = n


Therefore, coefficient of x0


Conclusion : coefficient of x0


1