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Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


Transcript

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) = (π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ π‘π‘Ÿπ‘–π‘šπ‘’ π‘›π‘’π‘šπ‘π‘’π‘Ÿπ‘  )/(π‘‡π‘œπ‘‘π‘Žπ‘™ π‘›π‘’π‘šπ‘π‘’π‘Ÿπ‘ ) = 10/30 = 𝟏/πŸ‘ 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 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.