Question 865062
There are 6 numbers in that set given. So there are 



6 choices for slot 1
5 choices for slot 2 (6-1 = 5)
4 choices for slot 3 (6-2 = 4)



Which means that there are 6*5*4 = 30*4 = <font size=4 color="red">120</font> different 3 digit numbers to form (without repetition).