Respuesta :
There will be 300 train routes are there if the 25 towns in a certain country and every pair of them are connected by a train route.
What are permutation and combination?
A permutation is the number of different ways a set can be organized; order matters in permutations, but not in combinations.
Total number of towns = 25
There will be one train route between the two towns
Total number of pairs = 25/2 = 12.5 ≈ 12
Number of train routes = 25×12
= 300
Thus, there will be 300 train routes are there if the 25 towns in a certain country and every pair of them are connected by a train route.
Learn more about permutation and combination here:
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