Find the 4^th term from the beginning and end in the expansion of .

To Find :

I. 4^th term from the beginning

II. 4^th term from the end

Formulae :

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For ,

, and n=9

As n=n ,therefore there will be total (n+1) terms in the expansion

Therefore,

I. For the 4^th term from the starting.

We have a formula,

For t₄ , r=3

Therefore, a 4^th term from the starting

Now,

II. For the 4^th term from the end

We have a formula,

For t_(n-2) , r = (n-2)-1 = (n-3)

……….

Therefore, a 4^th term from the end

Conclusion :

I. 4^th term from the beginning

II. 4^th term from the end