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From the ground floor to the (5)th floor, one may choose lift or stairs between each pair of floors. There are (2) choices per segment, but stairs cannot be chosen in two consecutive segments. How many ways are possible?

Answer and explanation

Correct answer: (13)

This is a (5)-position binary sequence with no consecutive stairs. A short recurrence count gives (13).

Related tags

PermutationsCombinationsCountingHardFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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