100 times in four games
43 times in five games
7 times in six games
3 times in seven games with 3-0 team winning
2 times in seven games with 0-3 team winning
The two times that the team down 3-0 rallied to win the series were in 1942 (Toronto over Detroit in the Stanley Cup final) and 1975 (Islanders over Pittsburgh in the second round). Thirty-three years between those two events and 33 years since the last time it happened.