What is Quantum probability?

Different approaches to quantum mechanics invoke different meanings of probability. What is “probability”?

This very amazing article discusses three of the leading approaches to quantum theory: the “dynamical collapse” theories, such as the GRW model, the “pilot wave” or “hidden variable” approaches (the de Broglie-Bohm theory), and the “many worlds” formulation suggested by Hugh Everett.(QuantaMagazine)

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