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Question: Answered & Verified by Expert
Two families with three members each and one family with four members are to be seated in a row. In how many ways can they be seated so that the same family members are not separated ?
MathematicsPermutation CombinationJEE MainJEE Main 2020 (06 Sep Shift 1)
Options:
  • A 2! 3! 4!
  • B (3!)3·(4!)
  • C  (3!)2.4!
  • D  3! 4!3
Solution:
2483 Upvotes Verified Answer
The correct answer is: (3!)3·(4!)

We will use the concept 'objects are together'

 3Total 3 families×3!2families with all 3 members together× 4family with all 4 together

=(3!)3×4!

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