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Let the complex number z = x + y + iy be such that i z 2 i 3 z 2   is purely imaginary. If x + y 2 = 0, then y 4 + y 2 – y is equal to

1. 3 2
2. 2 3
3. 4 3
4. 3 4

Correct answer: 4 3

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