CREATE TABLE table_50792 ("Event" CLOB, "Long Course/Short Course" CLOB, "Year Set" FLOAT, "Time" CLOB, "Meet" CLOB)

What year did a short course have a time of 7:51.80?
SELECT COUNT("Year Set") FROM table_50792 WHERE "Long Course/Short Course" = 'short course' AND "Time" = '7:51.80'
SELECT COUNT("Year Set") FROM "table_50792" WHERE "Long Course/Short Course" = 'short course' AND "Time" = '7:51.80'