Professor Templeton sat at his desk at the Redrum University updating his students grades into the school computer. Every time he needed to access a student's information he had to enter the last four digits of their social security number. It was a necessary but boring task and so his mind began to wander. The Prof. sat thinking about some of the past brain teasers he had seen on Brainden and was remembering one in particular when he stopped mid-keystroke with a thought. If he had 119 students, how probable was it that the last four digits of a social security number would be duplicated?

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## Prof. Templeton 10

Professor Templeton sat at his desk at the Redrum University updating his students grades into the school computer. Every time he needed to access a student's information he had to enter the last four digits of their social security number. It was a necessary but boring task and so his mind began to wander. The Prof. sat thinking about some of the past brain teasers he had seen on Brainden and was remembering one in particular when he stopped mid-keystroke with a thought. If he had 119 students, how probable was it that the last four digits of a social security number would be duplicated?

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