- The following incomplete tree diagram shows the relationships between the event \(A\) and the event \(B\).
\includegraphics[max width=\textwidth, alt={}, center]{77ae01cd-2b58-48ab-889f-272e27ecf99d-14_799_839_351_548}
Given that \(\mathrm { P } ( B ) = \frac { 9 } { 20 }\)
- find \(\mathrm { P } ( A )\) and complete the tree diagram,
- find \(\mathrm { P } \left( A ^ { \prime } \mid B ^ { \prime } \right)\).