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For a, b, c ∈ R if 〖ax〗^2 + bx + c is real for real values of x and imaginary for imaginary values of x, then:
a) a > 0 b) a < 0 c) a = 0 d) None of these

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TCS Other Question

If the roots of equation (q – r) x^2 + (r – p) x + p –q = 0 are equal then p, q, r are in:
a) AP b) GP c) HP d) None of these
N is natural no. N^3 can have maximum 16 factors then how many maximum factors can N^4 have?