Gloomy Probability

Jeff was invited to a night meeting. While he was getting ready, it goes dark in his room. He was in search of his blue jeans in his drawer. His drawer contains identical jeans of 3 3 colours; 28 28 black, 25 25 blue and 13 13 white jeans. How many jeans did he throw on his floor to be a 100 % 100\% sure that he has taken out a blue jean?


The answer is 42.

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1 solution

Saya Suka
Apr 26, 2021

Answer
= { Took out all the other colours first } + { 1 first blue jeans out the drawer }
= 28 + 13 + 1
= 42


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