Example
Example 5.9 There are n cells in the body, of which cells 1, … , k are target cells. Associated with each cell is a weight, with wi being the weight associated with cell i, i = 1, … , n. The cells are destroyed one at a time in a random order, which is such that if S is the current set of surviving cells then, independent of the order in which the cellsnot in S have been destroyed, the next cell killed is i, i ∈ S, with probability wi / j∈S wj . In other words, the probability that a given surviving