Problem #PRU-35561

Problems Set theory and logic Mathematical logic Mathematical logic (other)

Problem

Someone arranged a 10-volume collection of works in an arbitrary order. We call a “disturbance” a situation where there are two volumes for which a volume with a large number is located to the left. For this volume arrangement, we call the number \(S\) the number of all of the disturbances. What values can \(S\) take?