If z is a complex number such that \[\frac{z-1}{z+1}\] is purely imaginary, then [MP PET 1998, 2002]

If z is a complex number such that \[\frac{z-1}{z+1}\] is purely ima

1.	If z is a complex number such that \[\frac{z-1}{z+1}\] is purely imaginary, then [MP PET 1998, 2002]
A.	\[\|z\|\,=0\]
B.	\[\|z\|\,=1\]
C.	\[\|z\|\,>1\]
D.	\[\|z\|\,<1\]
Answer» C. \[\|z\|\,>1\]

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If z is a complex number such that \[\frac{z-1}{z+1}\] is purely imaginary, then [MP PET 1998, 2002]

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