Question

GIVEN: 5 MATH BOOKS AND 3 SCIENCE BOOKS . IN HOW MANY WAYS CAN WE ARRANGE ALL THE BOOKS IN A SHELF ?

Answer 1

The are 5 + 3 = 8 books altogether. The are 8 possibilities to choose the first book, 7 possibilities to choose second book and so on. So, the are 8*7*6*5*4*3*2*1 = 8! = 40320 ways to arrange these books on a shelf.