Find the coefficient of x3 in ( root x5 + 3/ root x3 ) 6

(2) Find rth 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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