Question

A literature course you are taking requires that you read 4 books during the semester from a reading list of 15 books. How many different groups of 4 can you select to read?

Answer 1

we have given that list of 15 books from that we need to choose 4 books.

we need to find how many different choices are made.

we know that formula is
`nCr_`.

where n is the number of books and r is number of books chosen.

`15C_(4)_ =(15*14*13*12)/(1*2*3*4)=1365` choices can be made.