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Posted by 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

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