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यदि D(r )=|(r,r^(3),2),(n,n^(3),2n),((n(...

यदि `D_(r )=|(r,r^(3),2),(n,n^(3),2n),((n(n+1))/(2),(n(n+1))/(2)^(2),2(n+1))|` हो तो `overset(n)underset(r=0)SigmaD_(r )` का मान ज्ञात कीजिए।

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