60 students were asked if they play football, basketball, and tennis. Every student played at least one of the sports. 12 of the students play all three sports. 30 of the students play tennis. 38 of the students play football. 25 of the students play football and basketball. 6 of the students play football and tennis but not basketball. 4 of the students play basketball and tennis but not football.
Two of the 60 students are chosen at random. Work out the probability that they both play basketball.
