Statistics - arrangement in a circle

[jra0718]

Homework Statement

Delegates from the G8 are to be seated around a circular table. How many different seating arrangements are possible if the French and Canadian delegates are to be seated next to each other, but the Russian and Japanese are not to be next to each other?

Homework Equations

n!/n

The Attempt at a Solution

I know that if they were seated in a row, the answer would be (7!x2) - (6!x4), but I do not know where to start when it comes to arranging them in a circle

 

[glebovg]

Hint: the number of permutations of n objects in a circle is (n - 1)!.