Answer:
15,240,960 serial numbers
Step-by-step explanation:
Since no repeats are allowed and the order matters, the number of possible serial numbers is given by the product of the permutation of 4 out of 9 letters by the permutation of 4 out of 10 numbers:

There are 15,240,960 ways to generate a serial number.
349.304347826097 that is the answer
Answer:

Step-by-step explanation:








Answer:
d. 40
Step-by-step explanation:
The number of faces, edges and vertices is related by the following formula:

In which V is the number of vertices, E is the number of edges and F is the number of faces.
In this question:

We want to find E. So



The correct answer is given by option D.
I think that the answer is (4,10). hope it helped :)