Final answer:
Adding a blank master to a slide presentation does not mean it has the default formatting of other masters; rather, it is typically a new slide layout for customization.
Step-by-step explanation:
Adding a blank master to a slide presentation does not necessarily mean that the blank master contains default formatting of other slide masters. Generally, in presentation software such as Microsoft PowerPoint, a blank master slide is a new slide layout that you can customize, and it may not include any formatting, allowing you to create your style from scratch. Therefore, it is false that a blank master contains the default formatting of other slide masters.