CREATE TABLE table_17010 ("Institution" TEXT, "Location" TEXT, "Founded" FLOAT, "Type" TEXT, "Enrollment" FLOAT, "Nickname" TEXT, "Joined" FLOAT, "Left" FLOAT, "Current Conference" TEXT)

What year did a school leave that was founded in 1880?
SELECT "Left" FROM table_17010 WHERE "Founded" = '1880'
SELECT "Left" FROM "table_17010" WHERE "Founded" = '1880'