SOLUTION: there are 20 seniors serving the student council of a certain high school.of these, 3 have not served before, 10 served on the council in their junior years, 9 in the sophomore yea

Question 201593: there are 20 seniors serving the student council of a certain high school.of these, 3 have not served before, 10 served on the council in their junior years, 9 in the sophomore years, and 11 in their freshmen years. there are 5 who served during both their sophomore and junior years, and 4 during both their freshmanand sophomore years. how many seniors served on the student council during each of the four years in high school?
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
This is a hard one to work through, but I think it is 0 served all 4 years.

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