A bag contains 3 red balls, 5 white balls and 7 black balls. What is the probability that a ball drawn from the bag at random will be neither red nor black?

(A) 1/5   (B) 1/3   (C) 7/15   (D) 8/15

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  1. Chapter 15 Class 10 Probability (Term 1)
  2. Serial order wise

Transcript

Question 3 A bag contains 3 red balls, 5 white balls and 7 black balls. What is the probability that a ball drawn from the bag at random will be neither red nor black? (A) 1/5 (B) 1/3 (C) 7/15 (D) 8/15 Here, P (neither red nor black) = P (white ball) Now, Number of white balls = 5 Total Number of balls = 3 + 5 + 7 = 15 Thus, P (neither red nor black) = P (white ball) = (๐‘๐‘ข๐‘š๐‘๐‘’๐‘Ÿ ๐‘œ๐‘“ ๐‘คโ„Ž๐‘–๐‘ก๐‘’ ๐‘๐‘Ž๐‘™๐‘™๐‘ )/(๐‘‡๐‘œ๐‘ก๐‘Ž๐‘™ ๐‘›๐‘ข๐‘š๐‘๐‘’๐‘Ÿ ๐‘œ๐‘“ ๐‘๐‘Ž๐‘™๐‘™๐‘ ) = 5/15 = ๐Ÿ/๐Ÿ‘ So, the correct answer is (B)

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.