Question 1133749
The study tour <u>MUST</u> have a lecturer and a student.

Case 1: 1 lecturer and 2 students

3 choices for lecturer and (6*5)=30 choices for the students. 3*30=90.

Case 2: 2 lecturers and 1 student 

(3*2)=6 choices for the lecturers and 6 choices for the student. 6*6=36 90+36= {{{highlight(126)}}}