After a genetics experiment on 51 pea plants, the number of plants having certain characteristics was tallied, with the results given to the right. Answer parts (a) through (c). 20 were tall;

27 had green peas;

37 had smooth peas;

12 were tall and had green peas;

19 had green peas and smooth peas;

7 had all three characteristics;

3 had none of the characteristics.