Ex 15.1, 24 - A die is thrown twice. What is probability - Die

  1. Chapter 15 Class 10 Probability
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Ex 15.1, 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 โ€“ 11 = 25 Probability that 5 will not come up either time = (๐‘‡๐‘œ๐‘ก๐‘Ž๐‘™ ๐‘œ๐‘ข๐‘ก๐‘๐‘œ๐‘š๐‘’๐‘  ๐‘คโ„Ž๐‘’๐‘Ÿ๐‘’ 5 ๐‘ค๐‘–๐‘™๐‘™ ๐‘›๐‘œ๐‘ก ๐‘๐‘œ๐‘š๐‘’ ๐‘ข๐‘)/(๐‘‡๐‘œ๐‘ก๐‘Ž๐‘™ ๐‘›๐‘ข๐‘š๐‘๐‘’๐‘Ÿ ๐‘œ๐‘“ ๐‘œ๐‘ข๐‘ก๐‘๐‘œ๐‘š๐‘’๐‘ ) = 25/36 Ex 15.1, 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 Probability that 5 will come up atleast once = (๐‘‡๐‘œ๐‘ก๐‘Ž๐‘™ ๐‘œ๐‘ข๐‘ก๐‘๐‘œ๐‘š๐‘’๐‘  ๐‘คโ„Ž๐‘’๐‘Ÿ๐‘’ 5 ๐‘ค๐‘–๐‘™๐‘™ ๐‘๐‘œ๐‘š๐‘’ ๐‘ข๐‘)/(๐‘‡๐‘œ๐‘ก๐‘Ž๐‘™ ๐‘›๐‘ข๐‘š๐‘๐‘’๐‘Ÿ ๐‘œ๐‘“ ๐‘œ๐‘ข๐‘ก๐‘๐‘œ๐‘š๐‘’๐‘ ) = 11/36

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.