Which of the following formulas is used to calculate the probability of independent events a and b?
a. p(a ∪ b)=p(a)+p(b)
b. p(a ∪ b)=p(a)·p(b)
c. p(a and b)=p(a)+p(b)
d. p(a and b)=p(a)·p(b)

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