If (xy)^(a - 1) = z, (yz)^(b - 1) = x, and (xz)^(c - 1) = y, and xyz is not -1, 0 or 1, then which of the followingis equal to ab + bc + ca?

If (xy)^(a - 1) = z, (yz)^(b - 1) = x, and (xz)^(c - 1) = y, and xyz

1.	If (xy)^(a - 1) = z, (yz)^(b - 1) = x, and (xz)^(c - 1) = y, and xyz is not -1, 0 or 1, then which of the followingis equal to ab + bc + ca?
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