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Mathematics, 10.11.2020 04:50 salgado100400

Which pair of complex numbers has a real-number product? (1 + 2i)(8i)
(1 + 2i)(2 - 5i)
(1 + 2i)(1 - 2i)
(1 +2i)(4i)

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Which pair of complex numbers has a real-number product? (1 + 2i)(8i)
(1 + 2i)(2 - 5i)
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