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If Dr=|2^(r-1)2(3^(r-1))4(5^(r-1))x y...

If `D_r=|2^(r-1)2(3^(r-1))4(5^(r-1))x y z2^n-1 3^n-1 5^n-1|` then prove that `sum_(r=1)^n D_r=0.`

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