7. If a + B = 3, cº + B3 = 7, then a and B are the roots of
(A) 3x2 + 9x + 7 = 0 (B) 9x2 – 27x + 20 = 0 (C) 2x2 - 6x + 15 = 0
(D) None of these
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A is the answer . may be i dont know
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