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Last updated at Dec. 8, 2016 by Teachoo

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Ex 15.1, 9 A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be (i) red? Total number of marbles = 5 + 8 + 4 = 17 Number of marbles which are white = 5 P(marble taken out is red) = (๐๐ข๐๐๐๐ ๐๐ ๐๐๐๐๐๐๐ ๐คโ๐๐โ ๐๐๐ ๐๐๐)/(๐๐๐ก๐๐ ๐๐ข๐๐๐๐ ๐๐ ๐๐๐๐๐๐๐ ) = 5/17 Ex 15.1, 9 A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be (ii) white? Total number of marbles = 17 Number of marbles which are white = 8 P(marble taken out is white) = (๐๐ข๐๐๐๐ ๐๐ ๐๐๐๐๐๐๐ ๐คโ๐๐โ ๐๐๐ ๐คโ๐๐ก๐)/(๐๐๐ก๐๐ ๐๐ข๐๐๐๐ ๐๐ ๐๐๐๐๐๐๐ ) = 8/17 Ex 15.1, 9 (Method 1) A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be (iii) not green? P(marble taken out is not green) = P(marble taken out is white) + P(marble taken out is red) = 8/17 + 5/17 = 13/17 Ex 15.1, 9 (Method 2) A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be (iii) not green? P(marble taken out is not green) = 1 โ P(marble taken out is green) Total number of marbles = 17 Number of marbles which are green = 4 P(marble taken out is green) = (๐๐ข๐๐๐๐ ๐๐ ๐๐๐๐๐๐๐ ๐คโ๐๐โ ๐๐๐ ๐๐๐๐๐)/(๐๐๐ก๐๐ ๐๐ข๐๐๐๐ ๐๐ ๐๐๐๐๐๐๐ ) = 4/17 P(marble taken out is not green) = 1 โ P(marble taken out is green) = 1 โ 4/17 = (17 โ 4)/17 = 13/17

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Ex 15.1, 9 You are here

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Ex 15.1, 20* (Optional)

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About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.