3. At a recent ASCE meeting 16 students showed up interested in participating in a design competition. Seven of them are senior level students and the rest freshman to junior level. The students decide to form four brainstorming groups each of which will be led by a senior. If you go around asking students whether they are seniors, how many students in total do you expect to talk with before you have identified four of the seniors? (2 points)

Fig: 1