CREATE TABLE table_71142 ("Rank" FLOAT, "Country/Region" TEXT, "Population" FLOAT, "Area  ( km 2  ) " FLOAT, "Density  ( Pop. per km 2  ) " FLOAT)

Can you tell me the sun of Population that has the Country/Region of hong kong, and the Rank smaller than 2?
SELECT SUM("Population") FROM table_71142 WHERE "Country/Region" = 'hong kong' AND "Rank" < '2'
SELECT SUM("Population") FROM "table_71142" WHERE "Country/Region" = 'hong kong' AND "Rank" < '2'