In this study, the author examined the validity of MATH 105 as a prerequisite to MATH 201. The data for this study was extracted directly from the examination results logic of the university. Descriptive statistics in form of correlations and linear regressions were used to analyze the obtained data. Three research questions were formulated and the collected data were analyzed using Minitab 16 statistical software. Some concepts of Graph theory were employed to answer one of the research questions and the other two using some statistical tools. The findings revealed that MATH 105 is a powerful predictor of students' performance in MATH 201. It then became obvious that a poor performance in MATH 105 is tantamount to a subsequent failure in MATH 201 while a good score in MATH 201 is a green light to passing MATH 201. Furthermore, it was recommended that MATH 105 should be retained and even thoroughly enforced as a prerequisite for MATH 201.