奇妙的数学 mathematics for CS

MIT open course - Mathematics for computer science -graphy theory:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-042j-mathematics-for-computer-science-fall-2010/video-lectures/

Q: What is the ratio of male's gender partner VS female's gender partner?

Uchicago claim:170%

ABC news claim:330%

Use graph theory to solve this question

Am: average # of opposite gender partner of men

Af:........................women

Am=sum Degree (x) /Vm

sum Degree x ：another of saying of E      (edges)

Af=..

 Am/Af = cancel the edges   -->Vf/Vm

approve that