Answer
$\bf{H}$
Work Step by Step
The probability of history books is: $\dfrac{85}{1000}$
The probability of fiction books is: $\dfrac{240}{1000}$
The probability of historical fiction books is: $\dfrac{25}{1000}$
Thus, the probability of history or fiction books but not the historical fiction books will be:
$\dfrac{85}{1000}+\dfrac{240}{1000}-\dfrac{25}{1000}$
or, $=\dfrac{3}{10}$
Therefore, the correct option is $\bf{H}$.
