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Let alpha,beta,gamma are real roots of ...

Let `alpha,beta,gamma` are real roots of `x^3-7x^2+ ax + 50 = 0` and `|alpha|,|beta|,|gamma|` are roots of `x^3-bx^2-cx-d=0`. If minimum integral value of `(b + d)` is k, then unit digit of k is

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