If (1+x^(2))^(n) = underset(r=0)overset(...

If `(1+x^(2))^(n) = underset(r=0)overset(n)suma_(r)x^(r )= (1+x+x^(2)+x^(3))^(100)`. If `a = underset(r=0)overset(300)suma_(r)`, then `underset(r=0)overset(300)sumra_(r)` is

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let underset(r=0)overset(2010)(sum)a_(r)x^(r)=(1+x+x^(2)+x^(3)+x^(4)+x^(5))^(402) and underset(r=0)overset(2010)(sum)a_(r)=a, then the value of ((underset(r=0)overset(2010)(sum)r.a_(r))/(underset(r=0)overset(2010)(sum)a_(r))) is equal to____.

If (1+x^(2))^(n) =sum_(r=0)^(n) a_(r)x^(r )= (1+x+x^(2)+x^(3))^(100) . If a = sum_(r=0)^(300)a_(r) , then sum_(r=0)^(300) ra_(r) is

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