Answer: The required number of cones is 1320.
Step-by-step explanation: Given that there are 12 flavors of ice-cream.
We are to find the number of cones that can be created with 3 different flavors, if it is important which flavor goes on the top, middle and bottom.
Since we cannot repeat the same flavor for top, middle and bottom, so
number of different choices available for the bottom, b = 12,
number of different choices available for the middle, m = 11
and
number of different flavors available for the top, t = 10.
Therefore, the number of cones that can be created with 3 different flavors is given by

Thus, the required number of cones is 1320.