I learned that if two players sack cooperatively, each defender gets 0.5 sacks in their statistics.
Then what happens if three players make a sack together? Is it 0.333 sacks, or still 0.5 sacks?
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In the NFL when multiple players sack the QB, they're all awarded a half a sack, regardless of how many players have been involved.
Here's explanation on Wikipedia
A player will receive credit for half of a sack when multiple players contribute to the sacking of a quarterback, even if more than two players contributed.
Note that a sack is not a rule. Rather a term for when a QB is taken down behind the line of scrimmage. So since it's a statistical term, you won't find an answer in usual sources like the NFL rules handbook.