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The least positive integer n, for which ...

The least positive integer n, for which `((1+i)^(n))/((1-i)^(n-2))`is positive is

A

2

B

1

C

4

D

3

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The correct Answer is:
B
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HIMALAYA PUBLICATION-COMPLEX NUMBERS-QUESTION BANK
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  7. If P(x, y) denotes z=x+i y in Argand's plane and |(z-1)/(z+2 i)|=1, t...

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  12. If z is a complex number with |z|=1 and z+(1)/(z)=x+iy, then xy=

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  13. The real part of log log i is

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