The question(as an example)
I have N cities and I need to find out how many paths does the circuit have.
The problem
For an assignment my teacher asked me to provide the answer as a function of N. Then he specified that I am not required to show the derivation process. What does it actually mean?
The answer should be:
a) n!-1
b) 19! -1 = 6,402,373,705,728,000
c) 18!
d) 18
Any suggestions?