Answer:
12P3 = 1320
Step-by-step explanation:
How you need select three persons of a group of twelve persons, but in the selection each member of the group has a different position, then you need use a permutation
Permutation is defined how
[tex]nPr = \frac{n!}{(n-r)!}[/tex]
In our case n = 12 and r = 3
Thus
[tex]12P3 = \frac{12!}{(12-3)!}[/tex]
12P3 = 1320