Probability is a study of the rules that offers the foundational statistics. This sets out the investigation where students' understanding of counting rules and its probability were explored using 20 items was developed and administered Statistics course. Data were captured through an interactive e Edmodo.com and analyzed using Winsteps 3.81.0. The results from the Wright map showed that 83.8% of the students have while 16.2% of the students need to be given more attention on the topic. The study was also able to show that the items can be replicated in other sample

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