[Math] How many ways to seat 4 couple and 2 single around a round table

combinatoricspermutations

How many ways to seat 4 couple and 2 single around a round table, provided that each couple will sit together

Best Answer

Edit: Sorry for the confusion!

Viewing each couple as a unit, you're arranging six units around a round table, for which there are $5! = 120$ ways, since we can fix one of the singles to a chair. Then, you can change the order within each couple, so there should be $120 \times 2^4 = 1920$ ways.