Suppose That 70% of the Seniors at a Large University

Multiple Choice

Suppose that 70% of the seniors at a large university have taken calculus, and 30% of the seniors have taken physics. Of the seniors who have taken calculus, 40% have taken physics. A student who is a senior at this university is randomly selected. Define the following events.
A = The student has taken calculus
B = The student has taken physics
-Find P(A?B)

A) 0.70 + 0.30 - 0.40 = 0.6
B) (0.70) (0.30) = 0.21
C) (0.70) (0.40) = 0.28
D) (0.30) (0.40) = 0.12