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In a certain bookcase, 10 books are about science, 8 are about literat

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Bunuel wrote:
In a certain bookcase, 10 books are about science, 8 are about literature, 5 are about history, and 2 are about psychology. If a book is selected at random, what is the probability that the book is about science or history?

A 0.08
B 0.2
C 0.3
D 0.4
E 0.6

A or B = A+B
So science or History 10+5

So probability:
10/25 + 5/25 = 15/25 = 3/5 = 0.6
E

P.S.- Please can we tag this question as Probability rather than Combinations