Find the coefficient of x^{3 }in ( root x^{5 }+ 3/ root x^{3 }) ^{6}

(2) Find r^{th} term from the end in ( x + a) ^{n}

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(2) rth term from the end would be (n-r+1)th term from the beginning in the expansion of (x+a)^n

T (r+1)= nCr x^(n-r) a^r is the formula.

Here put n-r in place of r to get (n-r+1)th term.

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