The addition law of probability theory is used to compute the probability for the occurrence of a union of two or more events; namely, given two events A and B, 
Definitions:
Significant Influence
The power to participate in the financial and operating policy decisions of an entity, but not control those policies.
Fair-value Method
An accounting strategy used to measure and report assets and liabilities on the basis of estimated fair market prices.
Equity Method
An accounting technique used to record investments in associated companies, recognizing the investor's share of the investees' income.
Retrospective Change
An adjustment applied to prior period financial statements to correct an error or reflect a new accounting policy as if it had always been applied.
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