1. 

   math_celebrity Administrator Staff Member

   The formula is nC2 - rC2 + 1
   
   In this problem:
   n = 8 and r = 3
   
   8C2 = 28
   3C2 = 3
   
   Evaluating, we have:
   28 - 3 + 1
   26
   
   

    

   math_celebrity, Jan 4, 2024

   #1
   
   

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