Now consider a base pair (i, j). If i ∈ A and j ∈ B, it must arise from the dimeric state. If i, j ∈ A or i, j ∈ B, however, it arises from the dimeric state with probability p* and from the monomeric state with probability 1 - p*. Thus the conditional pairing probabilities in the dimeric complexes can be computed as