in a statistics class 30% of students have taken linear algebra, 45% of the students haave taken calculus and 15% have taken both linear algebra and calculus. If a student is randomly selected from this class, what is the probability that he/she has taken either Linear algebra or calculus but not both

a. 0.85

b.0.75

c.0.9

d.0.45

e.0.6

f. none o the other choices gives the correct answer