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Grade: Select Grade 

                        
Sir can you explain the permutation formulas in the attachment? Especially the corollary part
4 years ago

Answers : (1)

Nishant Vora
IIT Patna
askIITians Faculty
2467 Points 
							for eg

if out of 30 players i want to select 11 players such that Dhoni, virat and sachin are always included

so 3 players i have already selected

now I just have to select 8 players out of 27 players
hence 27 C 3
3 years ago
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