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A mixture of CuS (molecular weight = `M_(1)`) and `Cu_(2)S` (molecular weight `=M_(2)`) is oxidised by `KMnO_(4)` (molecular weight `=M_(3)`) in acidic medium, where the product obtained are `Cu^(2+),Mn^(2+)` and `SO_(2)`. Find the equivalent weight of CuS, `Cu_(2)S` and `KMnO_(4)` respectively.