1. 

   Molly Ton up Member

   Hi Guys,
   
   How do we rewrite the given function as type 2 negative binom? i dont understand how this was done in the solutions.
   
   Thanks,
   Molly

    

   Molly, Sep 16, 2022

   #1
2. 

   Andrew Martin ActEd Tutor Staff Member

   Hi Molly
   
   choose(n+1, n) = (n+1)! / (n! * 1!) = (n+1)
   
   the 3^2 gives the 9 and then we have (1/4)^2 * (1/4)^n = 4^(-n-2)
   
   Hope this helps!
   
   Andy

    

   Andrew Martin, Sep 17, 2022

   #2

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