A coincidence is a remarkable concurrence of events or circumstances that have no apparent causal connection with
one another. The perception of remarkable coincidences
may lead to supernatural, occult, or paranormal claims. Or it
may lead to belief in fatalism, which is a doctrine that events
will happen in the exact manner of a predetermined plan.
From a statistical perspective, coincidences are inevitable and often less remarkable than they
may appear intuitively. An example is the birthday problem, which shows that the probability of
two persons having the same birthday already exceeds 50% in a group of only 23 persons.1