# Books of Calvin

Level pending

Calvin was Solve Problems in Brilliant, When forgot What Theorem That he should wear on a Question, Calvin decided Search the Book that contained the theorem that he forgot , He was on search of Book In A Bookcase that contained 20 Books, Being 12 Mathematics and Physics 8. Later he removed 2 Books and Without Replacement. What is the probability he Retrieved 2 Books of Math ?

Note : can be written as $$\frac{a}{b}$$ where $$a$$ and $$a$$ are coprime positive integers.

Find $$a+b$$

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