Example 9 Harpreet tosses two different coins simultaneously (say, one is of Re 1 & other of Rs 2). What is probability that she gets at least one head? Total possible outcomes = (H, H) , (H, T), (T, H), (T, T) Number of possible outcomes = 4 Total outcomes where she get atleast one head = (H, H) , (H, T), (T, H) Number of outcomes where she get atleast one head = 3 P(she gets atleast one head) = (𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑜𝑢𝑡𝑐𝑜𝑚𝑒𝑠 𝑤ℎ𝑒𝑟𝑒 𝑠ℎ𝑒 𝑔𝑒𝑡𝑠 𝑎𝑡𝑙𝑒𝑎𝑠𝑡 𝑜𝑛𝑒 ℎ𝑒𝑎𝑑)/(𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑝𝑜𝑠𝑠𝑖𝑏𝑙𝑒 𝑜𝑢𝑡𝑐𝑜𝑚𝑒𝑠) = 𝟑/𝟒

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Davneet Singh

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, Social Science, Physics, Chemistry, Computer Science at Teachoo.