Q.

Let C1 and C2 are concentric circles of radius 1 and 8/3, respectively, having center at (3, 0) on the argand plane. If the complex number z satisfies the inequality log1/3|z3|2+211|z3|2>1, then

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a

z lies outside both of C1 and C2

b

none of these

c

z lies outside C1 but inside C2

d

z lies inside of both C1 and C2

answer is A.

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Detailed Solution

log1/3|z3|2+211|z3|2>1,11|z3|2∣>0 |z3|2+211|z3|2<13 (3t8)(t1)<0( where |z3|=t) 1<|z3|<8/3

Hence, z lies between the two concentric circles.

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