exam Maths Puzzle Numerical Ability

Sample space = {A, B, C, D}

P(A) = 0.2, P(B) = 0.2, P(C) = 0.15, P(D) = 0.45

P(B, C, D) = _____

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exam Other Question

how i can dou that? find the product and sum of the roots of the equation {{{3x^3+6x^2-2x+9=0}}}


i didn't exactly know where to ask this so i am sorry if this is in the wrong section