If `a m p(z_1z_2)=0a n d|z_1|=|z_2|=1,t h e n` `z_1+z_2=0` b. `z_1z_2=1` c. `z_1=z _2` d. none of these

If |z_(1)+z_(2)|=|z_1|+|z_2| then

If |z_1/z_2|=1 and arg (z_1z_2)=0 , then

If |z_1|=|z_2|=|z_3|"…."=|z_n|=1 then |z_(1)+z_(2)+"….."+z_(n)|=

If |z_(1)+ z_(2)|=|z_(1)|+|z_(2)| , then arg z_(1) - arg z_(2) is

If |z_1|=15a d n|z_2-3-4i|=5,t h e n a. (|z_1-z_2|)_(min)=5 b. (|z_1-z_2|)_(min)=10 c. (|z_1-z_2|)_(m a x)=20 d. (|z_1-z_2|)_(m a x)=25

If |z_1|=|z_2|=|z_3|=1 then value of |z_1-z_3|^2+|z_3-z_1|^2+|z_1-z_2|^2 cannot exceed

|z_(1)|=|z_(2)|" and "arg z_(1)+argz_(2)=0 then

The points, z_1,z_2,z_3,z_4, in the complex plane are the vartices of a parallelogram taken in order, if and only if (a) z_1+z_4=z_2+z_3 (b) z_1+z_3=z_2+z_4 (c) z_1+z_2=z_3+z_4 (d) None of these

If z_1, z_2 in C ,z_1^ 2 in R ,z_1(z_1^ 2-3z_2 ^2)=2 a n d z_2(3z_1 ^2-z_2^ 2)=11 , then the value of z_1^ 2+z_2^ 2 is a. 10 b. 12 c. 5 d. 8