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ajinkya bhole Grade: 10
        we wish to select 6 persons of 8,but if the person A is selected then B must be chosen. in how many ways can the selection be made?(plz explain)
7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear ajinkya


case 1  :   A and B is not included


 then number of ways = 6C6 = 1


 


case 2 : B is selected A is not selected


 number of ways  = 1* 6C5  = 6


 


case 3:  A and B both are selected


 number of ways = 1*1* 6C4 = 15


 


so total ways  = 1+6+15 =22


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Badiuddin

7 years ago
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