In the following figure, rectangle represents Chefs, circle represents Racers, triangle represents Jugglers and square represents Golfers. Which set of letters represents Racers who are not Jugglers?
The weights of 4 boxes are 40, 30, 50 and 20 kilograms. Which of the following cannot be the total weight,in kilograms, of any combination of these boxes and in a combination a box can be used only once?