A catering service offers 7 appetizers 10 main courses and 7
     A catering service offers 7 appetizers, 10 main courses, and 7 desserts. A banquet committee is to select 5 appetizers, 9 main courses, and 6 desserts. How many ways can this be done?  There are  possible ways this can be done. 
  
  Solution
Selecting 5 appetizers=7C5
selecting 9 main course=10C9
selecting 6 desserts=7C6
Required selection=7C5*10C9*7C6=21*10*7=1470

