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Find the r^(t h)term from the end in th...

Find the `r^(t h)`term from the end in the expansion of `(x+a)^n`.

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We have to find `r^(th)` term from end in the expansion of `(x+a)^n`
It wil be same as `r^(th)` term from beginning in the expansion of `(a+x)^n`
From Binomial theorem, we have,
`T_r = n_(C_(r-1))*a^(n-(r-1))*x^(r-1)`
`T_r = n_(C_(r-1))*a^(n-r+1)*x^(r-1)`
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