Problem
• In San Francisco High, there are 20 seniors serving the supreme student council. Of the 20, 3 have not served before, 10 served during their junior years, 9 served during their sophomore years, and 11 served during their freshman years. In addition, there are 5 who served during both their sophomore and junior years, 6 during both their freshman and junior years, and 4 during both their freshman and sophomore years. Required: Determine the number of seniors who served on the student council during each of their four years in school.
• During the election in Los Angeles, the result is such that 300 voted in favor of Laid and Nate, 420 voted in favor of Leek and Laid, 240 voted in favor of Nate and Leek. Only 50 voted in favor of Laid, Nate, and Leek. According to statistics, there are 600 Nate diehards, 770 Laid diehards and 700 Leek diehards. If there are a total of 1300 registered voters in the precinct, what number of people did not vote in the election?