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let underset(r=0)overset(2010)(sum)a(r)x...

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____.

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The correct Answer is:
1005
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