Question

There are 6 periods in each working day of a school. In how many
ways can one organize 5 subjects such that each subject is allowed at
least one period?​

Answer 1

Answer:

1800 ways

5 subjects in 6 periods are = 6!

the number of ways to 5 subjects in 6 periods such that each subject is allowed at least one period = 5C1×6! 2! =5×360=1800 ways.