[" 5.If "Re((x-1)/(x+1))=0" ,where "z=x+1y" is a complex "],[" number,then which one of the following is correct? "]

If Re((z-1)/(z+1))=0 where z=x+iy is a complex number,then which one of the following is correct? (a) z=1+i(b)|z|=2 (c) z=1-i

If z complex number satisfying |z-1|=1 then which of the following is correct

If z complex number satisfying |z-1| = 1 , then which of the following is correct

If x prop 1/y and y prop 1/z then which one of the following relation is correct?

If k=x-y + 2z where -2 le x le 1, -1 le y le2 and 3 le z le 6 then which one of the following is correct ?

If |(y,x,y+z),(z,y,x+y),(x,z,z+x)|=0 , then which one of the following is correct ?

If cos^(-1)x+cos^(-1)y+cos^(-1)z=0, then which of the following is correct?

If |{:(y,x,y+z),(z,y,x+y),(x,z,z+x):}|=0 , then which one of the following is correct ?

If y=x+x^(2)+x^(3)+.... up to infinite terms where xlt1 , then which one of the following is correct?