Question:medium
In a class, 60% of the students know lesson I, 40% know lesson II and 20% know lesson I and lesson II. A student is selected at random. The probability that the student does not know lesson I and lesson II is:
In a class, 60% of the students know lesson I, 40% know lesson II and 20% know lesson I and lesson II. A student is selected at random. The probability that the student does not know lesson I and lesson II is:
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Drawing a Venn diagram is the most intuitive way to visualize these problems. Place the intersection value (20%) first, then fill the remaining sections (40% for 'Only I' and 20% for 'Only II'). The total inside the circles is 80%, leaving 20% outside.
Updated On: May 1, 2026
- \( 0 \)
- \( \frac{4}{5} \)
- \( \frac{3}{5} \)
- \( \frac{1}{5} \)
- \( \frac{2}{5} \)
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The Correct Option is D
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