Pembahasan Soal Ujian Profesi Aktuaris
SOAL
Jika A dan B merupakan himpunan kejadian, dan diketahui \(\Pr (A \cup B) = 1\), maka \(\Pr (A’ \cup B’)\) sama dengan …
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- \(1{\rm{ }}–{\rm{ }}Pr\left( {A’} \right){\rm{ }}–{\rm{ }}Pr\left( {B’} \right)\)
- \(Pr\left( {A’} \right){\rm{ }} + {\rm{ }}Pr\left( {B’} \right)\)
- \(Pr\left( {A’} \right){\rm{ }} + {\rm{ }}Pr\left( {B’} \right){\rm{ }}–{\rm{ }}1\)
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Diketahui | \(\Pr (A \cup B) = 1\) |
Rumus yang digunakan | \(\Pr (A) + \Pr (B) – \Pr (A \cap B) = 1\) |
Proses pengerjaan | \(\Pr (A \cup B) = 1\) \(\Leftrightarrow \Pr (A) + \Pr (B) – \Pr (A \cap B) = 1\) \(\Leftrightarrow \Pr (A) + \Pr (B) – 1 + \Pr (A’ \cup B’) = 1\) \(\Leftrightarrow \Pr (A) + \Pr (B) + \Pr (A’ \cup B’) = 2\) \(\Leftrightarrow \Pr (A’ \cup B’) = 2 – \Pr (A) – \Pr (B)\) \(\Leftrightarrow \Pr (A’ \cup B’) = \Pr (A’) + \Pr (B’)\) |
Jawaban | C. \(Pr\left( {A’} \right){\rm{ }} + {\rm{ }}Pr\left( {B’} \right)\) |