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 colours; black, blue and white jeans. How many jeans did he throw on his floor to be a sure that he has taken out a blue jean?
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Answer
= { Took out all the other colours first } + { 1 first blue jeans out the drawer }
= 28 + 13 + 1
= 42