Probability of OBP-B1 producing a certain number of supernovae based on the mass and age of the cluster. Given the age uncertainties in the combined OBP-B1 cluster and the independent OBP-Near and Briceño-1 clusters, we consider the “young” (<7.5 Myr old) and “old” (>9 Myr old) scenarios separately. We argue that the cluster is more likely to fall on the older side, so the black and red lines are most relevant to the arguments of this paper. For the old scenario, there is a 65% chance of at least one supernova and 35% of no supernovae. For the full age range, the corresponding odds of OBP-B1 producing one to two supernovae are 45%.