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N is natural no. N^3 can have maximum 16 factors then how many maximum factors can N^4 have?

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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
A person is asked to randomly pick two balls from a bag which has 15 yellow & 5 red balls. The probability that the person picks two balls of the same colour is
a) 33/38 b) 23/38
c) 38/43 d) 15/38