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[" 4.If "(xy)(a-1)=z,(yz)(b-1)=x," and "...

[" 4.If "(xy)(a-1)=z,(yz)(b-1)=x," and "(xz)(r-1)=y," and "],[xyz" is not "-1,0" or "1," then which of the following "],[" is equal to "ab+bc+ca" ? "]

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