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In The NCAA rulebook defines eligible receivers for college football in Rule 7, Section 3, Article 3.
The determining factors are the player's position on the field at the snap and their jersey number.
Specifically, any players on offense wearing numbers between 50 and 79 are always ineligible.
All defensive players are eligible receivers and offensive players who are not wearing an ineligible number are eligible receivers if they meet one of the following three criteria:
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