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If Deltar=|[2^(r-1)2 , 3^(r-1) , 4. 5^(r...

If `Delta_r=|[2^(r-1)2 , 3^(r-1) , 4. 5^(r-1)] , [x , y , z] , [2^n-1 , 3^n-1 , 5^n-1]|dot` Show that `sum_(r=1)^n Delta_r=Con s t a n t`

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