According to Piaget, combinatorial reasoning calls for systematic analysis of how various approaches can be used singly or in multiple use to find out an existing phenomenon or behaviour in a given situation. The focus of this investigation was to assess combinatorial reasoning in formal operations, as it obtains among university students in Kenya. The sample comprised 206 men and women selected from two universities in the City of Nairobi, Kenya, who were administered a questionnaire on combinatorial reasoning. Descriptive statistics were used for the analysis of data. The results showed that on the basis of percentage and chi-square the majority of participants had a mastery of combinatorial reasoning, thus confirming the notion that adolescents are capable of operating at the formal operations stage. The finding further confirmed the universality of Piaget’s theory of cognitive development.

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