CREATE TABLE table_204_794 (id DECIMAL, "iec\ world plugs\ Type" TEXT, "standard" TEXT, "power\ rating" TEXT, "earthed" TEXT, "polarised" TEXT, "fused" TEXT, "insulated\ pins" TEXT, "europlug\ compatible" TEXT)

what is the number of power rating for type a , b and c
SELECT COUNT(DISTINCT "power\nrating") FROM table_204_794 WHERE "iec\nworld plugs\nType" IN ('a', 'b', 'c')
SELECT COUNT(DISTINCT "power\nrating") FROM "table_204_794" WHERE "iec\nworld plugs\nType" IN ('a', 'b', 'c')