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If a > 0 and z = i – a ) i 1 ( 2 + , has magnitude 5 2 , then z is equal to :

1. – 5 1 + 5 3 i
2. i 5 3 – 5 1 –
3. i 5 3 – 5 1
4. i 5 1 – 5 3 –

Correct answer: i 5 3 – 5 1 –

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