Determine which of the following are not valid probability distributions,and explain why not. 
Definitions:
Social Publishing
The process of creating and distributing content on social media platforms to engage audiences, build brand awareness, or promote products and services.
Educational Publications
Materials such as books, journals, and digital content created specifically for the purpose of education and learning.
Professional Contributors
Individuals or entities that contribute their expert knowledge or skills to a project or content, often enhancing its credibility or value.
Psychic Income
Non-monetary benefits one gains from work or an activity, such as personal satisfaction, recognition, or enjoyment.
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