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Let f be a continuous function on [2, 5]...

Let f be a continuous function on [2, 5]. If f takes only rational values for all x and f(3) = 12, then f(4.5) is equal to

A

`(f(3)+f(4.5))/1.5`

B

12

C

17.5

D

`(f(4.5)-f(3))/1.5`

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