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Let f(x) = ax^2 + bx + c, where a, b, ca...

Let `f(x) = ax^2 + bx + c`, where a, b, care integers. Suppose `f(1) = 0, 40 < f(6) < 50, 60 < f(7) < 70, and 1000t < f(50)< 1000 (t + 1)` for some integer t. Then the value of t is

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