ML and 300 ml. There are some combinations of filling a bucket of 2000 ml.Calculation: 4 × 200 + 4 × 300 = 800 + 1200 = 20007 × 200 + 2 × 300 = 1400 + 600 = 20001 × 200 + 6 × 300 = 200 + 1800 = 20006 × 200 + 3 × 300 = 120 + 900 = 1020∴ 6 and 3 is not the correct combination of containers to fill a 2000 ml bucket