Four persons namely, David, Anwar, Nazma and Rita are to be seated in a row such that David and Anwar must sit next to each other and Rita and Nazma must sit next to each other. There are four seats in this row. How many distinct arrangements are possible?
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Combinatorics and counting has come up 24 times in 5 exams since 2009.
This question is on Permutations and combinations, part of Combinatorics and counting in Mathematics.
Counting arrangements and selections, with and without restrictions.
TestStop has 12 past-paper questions on this subtopic.
Question from the UoH 2015 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.