Question 89
In how many ways can the integers
$$
-5,-4,-3,-2,-1,1,2,3,4,5
$$
be arranged in a circle such that the product of each pair of adjacent integers is negative? (Assume that arrangements which can be obtained by rotation are considered the same.)
$$
-5,-4,-3,-2,-1,1,2,3,4,5
$$
be arranged in a circle such that the product of each pair of adjacent integers is negative? (Assume that arrangements which can be obtained by rotation are considered the same.)