Quantitative Aptitude :: Permutation and Combination - Discussion

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Explanation:
As chennai is always there,
So tourist have to choose 2 cities out of 4 cities(excluding chennai) and this can be done by
Chennai must always be includes.
for 3 cities 4C2*3! => 6*3! => 36
for 4 cities 4C3*4! => 4*4! => 96
for 5 cities 4C4*5! => 1*5! => 120
So, Total = 5!+4*4!+6*3!