Question 748639
Assuming they all have different names 7!

(counting principle)




Take a look:

7 ways to list first name
6 ways for the second
5 for the third
4 the fourth
3 fifth
2 sixth
1 last

the total number of ways is the product:

(7)(6)(5)(4)(3)(2)(1)=7!


Hope this clears things up
:)