Question

Choose the correct option.
If "C5 = "Co, then find the value of n.​

Answer 1

Answer:

Step-by-step explanation:

It is given that,

n

C  

5

​

=  

n

C  

6

​

 

⟹  

5!(n−5)!

n!

​

=  

6!(n−6)!

n!

​

 

⟹6×5!(n−6)!=5!(n−5)(n−6)!

⟹6=n−5

⟹n=11

Hence,    

13

C  

n

​

=  

13

C  

11

​

 

⟹  

11!×2!

13!

​

=  

2

13×12

​

=78