#Extensional versus Intuitive Reasoning: The Conjunction Fallacy in Probability Judgment

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''What is more likely, that a seven-letter word randomly selected from a novel would end in ing or has the letter “n” as its sixth letter? This highlights both the availability bias and the conjunction fallacy. All seven-letter words ending with ing have the letter “n” as its sixth letter, but not all with the letter “n” as its sixth letter end in ing. Again, the driving force for the conjunction fallacy is the availability bias. Words ending with ing come to mind more easily.''

-Tversky and Kahneman, Extensional versus Intuitive Reasoning: The Conjunction Fallacy in Probability Judgment