Answer:
24
Step-by-step explanation:
the set of numbers are{3,2,7,9} four numbers
you have 4 choices n!=4!=4*3*2*1=24
the number of choices minus set of 3 digit numbers(no repetition)
(n-r)! without repetition :(4-3)!=1!=1
P=24 3-digit numbers if no repetition allowed
