CREATE TABLE table_name_21 (attendance INT, score VARCHAR, opponent VARCHAR)

Score of 3 2, and a Opponent of reds had what sum of attendance?
SELECT SUM(attendance) FROM table_name_21 WHERE score = "3–2" AND opponent = "reds"
SELECT SUM("attendance") FROM "table_name_21" WHERE "3–2" = "score" AND "opponent" = "reds"