This study seeks to (re)define the teaching of combinatorics, mobilizing its rationale in a study process supported by a teaching device, and articulating these elements with teacher training, integrating mathematical and didactic knowledge in this field. The theoretical and methodological framework of this study is based on the Anthropological Theory of Didactics and is methodologically guided by the principles of Didactic Engineering, which encompassed its four phases: preliminary analysis, a priori analysis, in vivo analysis, and a posteriori analysis. A Study and Research Path was developed with a group of mathematics teachers as part of a training process. The results indicate that the SRP went beyond the limits of combinatorics and mathematics itself, taking on an interdisciplinary character and enabling the coordinated study of different counting problems, in contrast to traditional segmented teaching. In addition, the study highlighted the need for and importance of experiencing this SRP in high school classes.
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