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Question 4 A number is selected at random from the numbers 1 to 30. The probability that it is a prime number is: (a) 2/3 (b) 1/6 (c) 1/3 (d) 11/30 Total numbers = 30 Prime numbers are… 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43… Number of prime numbers less than 30 = 10 Thus, P(getting a prime number) = (𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑝𝑟𝑖𝑚𝑒 𝑛𝑢𝑚𝑏𝑒𝑟𝑠 )/(𝑇𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟𝑠) = 10/30 = 𝟏/𝟑 So, the correct answer is (c)

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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 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.