Write the Word or Phrase That Best Completes Each Statement $A_{1}, A_{2}, \ldots, A_{n}$

Essay

Write the word or phrase that best completes each statement or answers the question.
-Assume that the events $A_{1}, A_{2}, \ldots, A_{n}$ are mutually exclusive events whose union is the sample space, and that $B$ is an event that has occurred. Use Bayes' theorem to write an equation for $\mathrm{P}\left(\mathrm{A}_{1} \mid \mathrm{B}\right)$ .