Problem K. 495. (February 2016)
K. 495. In a class of 30 students, there are 12 more girls than boys. A team of three members is to be selected that contains at least one boy and at least one girl. How many different teams are possible? (Two teams are considered different if there is at least one person who is a member of one team but is not a member of the other.)
(6 pont)
Deadline expired on March 10, 2016.
Statistics:
112 students sent a solution.  
6 points:  62 students. 
5 points:  6 students. 
4 points:  23 students. 
3 points:  5 students. 
2 points:  13 students. 
0 point:  3 students. 
