Four books, one each in Chemistry, Physics, Biology and Mathematics, are to be arranged in a shelf. In how many ways can this be done?

Four books, one each in Accounting, Audit, Economics and Mathematics are to be arranged on shelf. In how many ways can this be done?

In how many ways can 4 different books, one each in chemistry, physics, biology and mathematics, be arranged on a shelf?

There are 12 different books in a shelf. In how many ways we can select atleast one of them?

There are 10 different books in a shelf. In how many ways we can select atleast one of them ?

There are three different rings to be worn in four fingers with at most one in each finger. In how many ways can this be done?

In how many ways can 7 different books be arranged on a shelf? In many ways three particular books are always together?

There are 3 candidates for a Physics, 5 for a Chemistry and 4 for a Mathematics scholarship. In how many ways one can these scholarships be awarded ?(one scholarship per subject)

There are 3 candidates for a Physics, 5 for a Chemistry and 4 for a Mathematics scholarship. In how many ways can these scholarships be awarded ?(one scholarship per subject)