MBA
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The cubic polynomial x3 + bx2 + cx + d cannot be expressed in the form (x + m) (x2 + nx + o) where a, b, c, m, n, o are all integers if and only if 1) d and b is even, c is odd 2) (bd + cd) is odd 3) d is even, b and c are odd 4) none of these
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