For the radio station problem, to calculate every possible set of substations, it takes O(n!). But I'm seeing the values in the 9.17 table is computed based on O(2^n).
For e.g. 5 stations, 2^5 = 32 subsets. So it takes 10 subsets per second, it is 3.2 sec
But should it be, 5! = 120 subsets. So time taken for 5 stations = 12 sec
Similarly for the other cases in the table
Correct me if my understanding is wrong.
