Fatto generale: 615 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 615 is the trinomial coefficient T(10,6).
Trivia: 615 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: September 6th is the day in 1985 that Midwest Express Airlines Flight 105, a Douglas DC-9 crashes just after takeoff from Milwaukee, Wisconsin, killing 31.