Two families with three members each and one family with four members are to be seated in a row. In how many…

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 ?
  1. 2! 3! 4!
  2. (3!)3·(4!)
  3.  (3!)2.4!
  4.  3! 4!3

Solution

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!

Asked in: JEE Main 2020 (06 Sep Shift 1)

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