if a and b are independent events with p(a) = 0.7 and p(b) = 0.2, then _____.
a. p(a ∩ b) = 0.90
b. p(a ∩ b) = 0.45
c. p(a ∩ b) = 0
d. p(a ∩ b) = 0.14