Question

There are three books of poetry, five history books, and four about animals on a shelf. What is the probability of choosing a book about history and then a book about animals?

Answer 1

Total number of books = 12

`P\mleft(history\mright)=(5)/(12)`

since one book has been taken

`P\mleft(animals\mright)=(4)/(11)`

The probability is then the product of both probabilities, that is:

`P\mleft(historyandanimals\mright)=(5)/(12)*(4)/(11)`

Solving we get:

`P\mleft(historyandanimals\mright)=(20)/(121)`