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  1. Chapter 15 Class 10 Probability
  2. Serial order wise
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Ex 15.1, 20* (Optional) Suppose you drop a die at random on the rectangular region shown in Fig. 15.6. What is the probability that it will land inside the circle with diameter 1m? Here, we use area to find probability Now, Diameter of circle = 1 m Radius of circle = 1/2 m Now, Area of rectangle = Length × Breadth = 3 × 2 = 6 m2 And, Area of circle = πr2 = π(1/2)^2 = π ×1/4 m2 Now, P (die will land inside circle) = (𝐴𝑟𝑒𝑎 𝑜𝑓 𝑐𝑖𝑟𝑐𝑙𝑒)/(𝑇𝑜𝑡𝑎𝑙 𝐴𝑟𝑒𝑎) = (𝜋 × 1/4)/6 = 𝜋/(6 × 4) = 𝜋/24 So, Probability is 𝝅/𝟐𝟒

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.