Question

1.      A student has to take 7 more courses before she can graduate. If none of the courses are prerequisites to others, how many groups of three courses can she select for the next semester?  

 

Answer 1

we use combination

C(7,3) which becomes (7 * 6* 5) / ( 3 * 2) = 35

we conclude that she can select 35 groups of three courses