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Q.

For two non-zero complex numbers  z1 and z2, if Re(z1 z2) = 0 and Re (z1+z2) = 0, then which of the following are possible?

A) Im (Z1) > 0 and Im(Z2) > 0                  B) Im(Z1 ) < 0 and Im( Z2) > 0

C)  Im ( Z1) > 0 and Im(Z2) < 0               c)  Im (Z1 ) < 0 and Im(Z2) < 0

Choose the correct answer from the option given below;

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a

B and D

b

A and B 

c

A and C

d

B and C

answer is B.

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Detailed Solution

detailed_solution_thumbnail

Let  z1=x1+iy1 and  z2=x2+iy2 since, given Re (z1z2)=x1x2y1y2=0 So, x1 and  x2 are of opposite sign and  y1 and y2 are of opposite sign.

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