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Let z ∈ C with Im(z) = 10 and it satisfies n z 2 n – z 2 + = 2i – 1 for some natural number n. Then :

1. n = 20 and Re(z) = –10
2. n = 40 and Re(z) = 10
3. n = 40 and Re(z) = –10
4. n = 20 and Re(z) = 10

Correct answer: n = 40 and Re(z) = –10

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