Assuming that f(x) is a continuous function (naively the function has no holes, jumps, and the function does not tend to positive or negative infinity -- i.e. you could draw the function from x=a to x=b without lifting your pencil) then **the answer is (c).**

If f(a)f(b)<0 then exactly one of f(a) or...

(The entire section contains 178 words.)

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