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কোন সমীকরণের একটি মূল $2 + i \sqrt{3}$ ?

x^{2} + 4 x - y = 0

x^{2} - 3 x + 2 = 0

x^{2} - 4 x + 7 = 0

x^{2} - 4 x - 7 = 0

ANS : 3

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