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Let `f(x)` be a continuous function defined for `1 <= x <= 3.` If `f(x)` takes rational values for all `x and f(2)=10` then the value of `f(1.5)` is :

A

8

B

`(f(1)+f(3))/3`

C

20

D

none of these

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The correct Answer is:
D
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