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[GMAT math practice question]
What is the equivalent expression of (1/x+y+z)(1/x+1/y+1/z)(1/xy+yz+zx)(1/xy+1/yz+1/zx)?
A. 1/x+y+z
B. 1/xy+yz+zx
C. 1/xyz
D. (1/xyz)^2
E. xy+yz+zx/x+y+z
What is the equivalent expression of (1/x+y+z)(1/x+1/y+1/z)(1/xy+yz+zx)(1/xy+1/yz+1/zx)?
A. 1/x+y+z
B. 1/xy+yz+zx
C. 1/xyz
D. (1/xyz)^2
E. xy+yz+zx/x+y+z
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