To Find : 4^th term from the end

Formulae :

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For ,

, and n=9

As n=9 ,therefore there will be total (9+1)=10 terms in the expansion

Therefore,

4^th term from the end = (10-4+1)^th, i.e. 7^th term from the starting.

We have a formula,

For t₇ , r=6

……….

Therefore, a 4^th term from the end

Conclusion : 4^th term from the end