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Suppose f(x) = {:(a+bx,xlt1),(4,x=1),(b-...

Suppose f(x) = `{:(a+bx,xlt1),(4,x=1),(b-ax,xgt1):}` and if `underset(x rarr 1)lim f(x)=f(1)`, what are possible values of a and b?

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