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If Deltar=|[x,y, z],[2^r,2xx3^r,3xx4^r],...

If `Deltar=|[x,y, z],[2^r,2xx3^r,3xx4^r],[2(2^n-1),3*(3^n-1),4*(4^n-1)]|` ' Find the value of `sum_(r=1)^nDelta_r`

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