2n- X 2n 3. Let f(x)- x-x +... + xxx-ax+b. Which value for'the pair (a,b) will X guarantee that the x-axis will be tangent to the graph of /(x) at x 1 A) (n,n-1) B) (n+1,n) C) (1,1) D) (n-1,n) E) (n,n+1)

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