Georg Simmel and W.E.B. Du Bois both write about duality in their social theorie

Georg Simmel and W.E.B. Du Bois both write about duality in their social theories. a. According to Simmel and to Du Bois duality is a feature of social interaction. Compare and contrast their theories of dualism.
b. How does Simmel’s social type “The Stranger” illustrate his concept of duality?
c. Use Simmel or Du Bois’ theory, provide an example and analysis of how duality operates in your own life.
please use these sources
https://www.britannica.com/biography/W-E-B-Du-Bois