In how many ways can 11 persons be arranged in a row such that 3 persons particular person should always be together
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Answer:
9!*3!
Step-by-step explanation:
Given that three particular persons should always be together. Hence, just group these three persons together and consider as a single person.
Therefore we can take total number of persons as 9. These 9 persons can be arranged in
9
!
ways.
We had grouped three persons together. These three persons can be arranged among themselves in
3
!
ways.
Hence, required number of ways
= 9!*3!
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