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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