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Subjects
Class 11MathematicsPermutations and CombinationsPermutationsMedium
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In a row of (10) people, how many arrangements are possible if two particular people always stay together?

Answer and explanation

Correct answer: (725760)

Treat the two particular people as one block, then (9!\cdot2!=725760). In exams, include the internal arrangement of the block.

Related tags

PermutationsTogetherBlock MethodPermutations And CombinationsMathematicsClass 11 Mcq
सुधार सुझाएँ / Earn

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  5. 5Three distinct prizes are to be awarded to seven students. No student can receive more than one prize. How many ways are possible?
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  7. 7What is the value of \(\frac{21!}{19!\cdot2!}-\frac{18!}{16!\cdot2!}\)?
  8. 8If \(\frac{(n+1)!}{(n-1)!}-\frac{n!}{(n-2)!}=24\), what is the value of \(n\)?
  9. 9What is the value of \(\frac{22!}{20!\cdot 2!}-\frac{21!}{20!}\)?
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