Question

Among a group of 60 investors, 17 owned shares of Stock A, 22 owned shares of Stock B, 27 owned shares of Stock C, 7 owned shares of both Stock A and Stock B, 9 owned shares of Stock A and Stock C, 10 owned shares of Stock B and Stock C, and 5 owned shares of all three. How many investors did not have shares in any of the three? How many owned shares of either Stock A or Stock C but not Stock B?
Answer

15; 24

15; 23

20; 19

15; 19