Question 1011662: Five peoole are to be arranged in a row for a photogragh. How many arrangements are there if a married couple in the group insist on sitting next to each other?
Answer by mathmate(429)   (Show Source):
You can put this solution on YOUR website!
Question:
Five peoole are to be arranged in a row for a photogragh. How many arrangements are there if a married couple in the group insist on sitting next to each other?
Solution:
If they stick together, they can be considered as one entity, so the number of arrangements would be P(4,4)=4!.
However, since they could change positions in 2!=2 ways, so the total number of arrangements is 2!4!=48 ways..
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