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How logical are the logic questions in IQ tests?
In the paper, we discuss some of the logic questions used in various exams, tests and quizzes. These logic questions were originally used in IQ tests measuring psychological condition or intellectual level of people under study. Nowadays these tests are very popular in all levels of education: from primary school to PhD level. The paper will give a constructive criticism of the problem types used for such IQ tests. The paper contains many recommendations for the improvement of these tests and their quality. We separate two types of questions: 1) those which are deterministic – problems that you can solve using mathematical knowledge and skills, and 2) probabilistic – problems which can be solved with the presence of some luck or chance. We recommend not to use such incomplete problems of the second type in important exams and tests. The logic questions containing elements of chance can be used for recreational purposes but entrance or graduation exams, tests for job applicants is not a correct place to use such questions. We will also discuss negative effects of the use of the questions of the second type on school children and their understanding of mathematics.