Posted by **Carlos** on Monday, March 26, 2007 at 11:43am.

In how many ways can 7 instructors be assigned to seven sections of a course in mathematics?

seven factorial.

The first instructor can go to seven classes:

THe second to six classes, ...

7*6*5*...

7!

so... 5040

7X6X5X4X3X2X1

= 5040

7