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IfDeltan=|{:(a^(2)+n,ab,ac),(ab,b^(2)+n,bc),(ac,bc,c^(2)+n):}|,n in N and the equation x^(3)-lambdax^(2)+11x-6=0 has roots a,b,c and a,b,c are in AP. The value of sum_(r=1)^(30)((27Delta_(r)-Delta3_(r))/(27r^(2)))is

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Answer :C


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