Seating with a gap
Three (distinct) people are to be seated in a row of chairs so that no two of them occupy adjacent chairs. How many seatings are possible?
Show hints (2)+
- Lay out the empty chairs first; they make gaps to drop people into.
- Choose of the gaps, then order the distinct people: .
Answer
Reveal answer →Final answer
60
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Asked at: Timed Mental-Math & Sequences, Game-Based Aptitude