This  would be  6C3
= 6*5*4
----------  =  20 answer
  3*2*1
        
             
        
        
        
4/6 
4/6 = 2/3
4/6 = 8/12
Answer : 2/3 and 8/12
        
                    
             
        
        
        
Use the binomial theorem:

The <em>x</em> ³ terms occurs for 5 - <em>k</em> = 3, or <em>k</em> = 2, and its coefficient would be

 
        
             
        
        
        
Answer:
20
Step-by-step explanation:
x - 9 = 11
+9         +9
x = 20