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A travel plan visits 3 cities A, B and C. For each city, 2 hotels and 3 local transport options are available. If the order of cities is fixed, how many plans are possible?

Answer and explanation

Correct answer: 6^3

The fundamental principle of counting says that when one choice is made independently at each stage, the total number of outcomes is found by multiplying the numbers of choices. For each fixed city, there are 2 hotel choices and 3 transport choices, giving 2 × 3 = 6 combinations. Since the order A, B, C is already fixed, there is no additional factor of 3! for arranging the cities. The six choices occur independently for each of the three cities, so the total is 6 × 6 × 6 = 6^3 = 216. Hence option A is correct; 18 adds choices instead of combining stages.

Related tags

Fundamental Principle Of CountingMultiplication RuleIndependent ChoicesPermutations And CombinationsMathematicsClass 11 Mcq

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