A watch salesman strated his day with 11 identical watches. During the first hour of the day, he visited exactly 4 people and sold at least one watch. In how many ways could he have sold the watches during the first hour of the day?

• here the given condition is atleast 4 watches it means that x>=4
  4c1*11c1+4c2*11c2+4c3*11c3+4c4*11c4
  we select one person from 4 and then we can sell him one watch among 11 it can be donein above waysss..
• 6 years agoHelpfull: Yes(0) No(0)