Ex 14.1, 24 - Chapter 15 Class 10 Probability (Important Question)

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Ex 14.1, 24 A die is thrown twice. What is the probability that 5 will not come up either time? Total number of outcomes = 36 Total outcomes where 5 comes up = 11 Total outcomes where 5 will not come up = 36 – 11 = 25 Now, Probability that 5 will not come up either time = (𝑇𝑜𝑡𝑎𝑙 𝑜𝑢𝑡𝑐𝑜𝑚𝑒𝑠 𝑤ℎ𝑒𝑟𝑒 5 𝑤𝑖𝑙𝑙 𝑛𝑜𝑡 𝑐𝑜𝑚𝑒 𝑢𝑝)/(𝑇𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑜𝑢𝑡𝑐𝑜𝑚𝑒𝑠) = 𝟐𝟓/𝟑𝟔 Ex 14.1, 24 A die is thrown twice. What is the probability that (ii) 5 will come up atleast once? Total number of outcomes = 36 Total outcomes where 5 comes up atleast once = 11 Now, Probability that 5 will come up atleast once = (𝑇𝑜𝑡𝑎𝑙 𝑜𝑢𝑡𝑐𝑜𝑚𝑒𝑠 𝑤ℎ𝑒𝑟𝑒 5 𝑤𝑖𝑙𝑙 𝑐𝑜𝑚𝑒 𝑢𝑝)/(𝑇𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑜𝑢𝑡𝑐𝑜𝑚𝑒𝑠) = 𝟏𝟏/𝟑𝟔

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo