Q. 40 C

Find the term independent of x in the expansion of :

Answer :

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


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

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