Question

In how many ways can 4 different books each in chemistry ,physics,biology and mathematics be arrange in a self?

Answer 1

It can be arranged in 24 ways...there is a formule for these types of questions which is....
product of numbers of items...
here we have 4 books so 4×3×2×1=24

Answer 2

Answer is to have to put 4P4 in your calculator and you will get an answer of 24