How many ways can you seat 5 gentlemen and 3 ladies around a circular table with the requirement that every gentleman is seated next to at least one lady?

1 Answer
Mar 21, 2016

Depending upon the interpretation,
either
XXX5!3!=720
or
XXX85!3!=5760

Explanation:

Starting at some seating position the pattern must be:
XXX2 gentlemen - 1 lady - 2 gentlemen - 1 lady - 1 gentleman - 1 lady

If different starting locations for this pattern are considered the same seating pattern:
There are 5! ways of distributing the gentlemen among their seats
and for each of these, there are 3! ways of distributing the ladies among their seats
for a total of 5!3! different seating patterns.

If the starting location for this pattern is considered to give a different way of seating then
there will be 8 times as many seating patterns.
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