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यदि दो घटनाओ A और B के लिए, \(\mathrm{P}(\mathrm{A})=0.8, \mathrm{P}(\mathrm{B})=0.5\) तथा \(\mathrm{P}(\mathrm{B} / \mathrm{A})=0.4\) हो, तो \(\mathrm{P}(\mathrm{A} \cup \mathrm{B})\) ज्ञात करें।

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दिया है- \(\mathrm{P}(\mathrm{A})=0.8, \mathrm{P}(\mathrm{B})=0.5\)

अब \(\mathrm{P}(\mathrm{A} \cap \mathrm{B})=\mathrm{P}(\mathrm{A}) \times \mathrm{P}(\mathrm{B})=\frac{0.8}{10} \times \frac{0.5}{10}=0.40\)

अब \(\mathrm{P}(\mathrm{A} \cup \mathrm{B})=\mathrm{P}(\mathrm{A})+\mathrm{P}(\mathrm{B})-\mathrm{P}(\mathrm{A} \cap \mathrm{B})\)

\(=0.8+0.5-0.40\)

\(=0.90\)

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