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Go Function 3

Algebra Level 4

Let $f(x)=x^4 + ax^3 + bx^2 + cx + d$ . If $f(2) = 1$ , $f(3) = 2$ , $f(4) = 3$ and $f(5) = 4$ , what is $a+b+c+d$ ?

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by Christian Daang

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