Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Mathematics Complex Numbers Properties of Complex Numbers
If z is a complex number such that \(\frac{z-1}{z+1}\) is purely imaginary, then what is |z| equal to ?
1
\(\frac{1}{2}\)
2
\(\frac{2}{3}\)
3
1
4
More than one of the above
5
None of the above