CREATE TABLE table_42784 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Attendance" TEXT)

What is the Score of the game with arsenal win 4-2 on penalties in the attendance field?
SELECT "Score" FROM table_42784 WHERE "Attendance" = 'arsenal win 4-2 on penalties'
SELECT "Score" FROM "table_42784" WHERE "Attendance" = 'arsenal win 4-2 on penalties'