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Q.

Let a complex number z,|z|≠1, satisfy log12|z|+11(|z|-1)2≤2. Then, the largest value of |z| is is =

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a

8

b

7

c

5

d

6

answer is B.

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Detailed Solution

Given log12z+11z−12≤2⇒z+11z−12≥12cross multiply and then simplify 2z+22≥z2−2z+1z2−4z−21≤0z−7z+3≤0It implies z≤7
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