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Q.

If z - 1 <  2z-2 then the locus of z = x + iy is

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a

x2 + y2 + 3x - 2 = 0

b

3x2 + 3y2 - 14x + 15 > 0

c

3x2 + 3y2 - 14x + 15 < 0

d

3x2 + 3y2 - 14x + 15 = 0

answer is B.

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Detailed Solution

z-1<2z-2, z=x+iy x+iy-1<2x+iy-2 (x-1)+iy<2(x-2)+iy (x-1)2+y2<2(x-2)2+y2 (x-1)2+y2<4(x-2)2+y2 x2-2x+1+y2<4x2-16x+16+4y2 3x2+3y2-14x+15>0

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