A class of 26 students includes 12 who play football, 15 who play basketball, and 4 who play both soccer and baseball. How many students in the class play neither piano nor guitar? Show work
A college offers 2 introductory courses in history, 3 in science, 2 in philosophy, 4 in mathematics, and 3 in English. If a freshman takes one course in each area during her first semester, how many course selections are possible? Show work
A couple is planning to have 4 children. They could be all girls, all boys, or some of each. How many groupings are possible? Solve using the multiplication principle of counting. Show work