Paulos uses the assumption that each of the United States’ adults knows about 725 people spread throughout the U.S., there is a 1 in 100 probability that two people will have an acquaintance in common. There is more than a 99 out of 100 chance that the strangers will be linked by two intermediates. Paulos backs up this theory by those of shared birthdays. He says that one mistake many people make is to look for a specific event opposed to a particular event when trying to prove the theory. For example, it may be highly unlikely that two people in a location share the birthday of March 16, yet it is very likely that two people in a crowd will have a birthday in common. “Some birthday” is any days within a specific month, but the “Particular Birthday” is the day in the specific month.
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