How did you get admitted to a Masters program without a background in CS? Most CS departments (Masters, PhD) look for standard courses in programming and data s

How did you get admitted to a Masters program without a background in CS? Most CS departments (Masters, PhD) look for standard courses in programming and data structures. I ask a fellow pure math degree holder with little CS coursework. I intend to pursue a PhD in CS and enrolled as a post-bac to make up the coursework to then apply for graduate programs.