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Difficulty: EasyPuzzle Details

If there are 4 empty seats in a theatre, how many combinations are there for the number of ways 4 people could sit in these seats?

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[Ref: ZBAA]  

Answer: 24.

Think of naming the people A, B, C and D. If A sat on the left then the others could sit in one of these ways: BCD, BDC, CBD, CDB, DBC, DCB - 6 ways. But any one of the four could sit on the left seat, so we must multiple our answer by 4, giving 24.


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