1/2 is half and he would buy half a pound of cheese
        
                    
             
        
        
        
Total number of members = 12
Members to choose at a time = 2
This is a combination problem and we are to find the combination of 12 objects taken 2 at a time i.e. we are to find 12C2
12C2 = 66
So, there are 66 ways of selecting a president and vice president. 
Therefore, the correct answer is option D
        
             
        
        
        
Attached below is the problem that I worked out. And I checked my answer simply by plugging it in
 
        
        
        
Answer:
the answer is A=0.1 and B=0.85
Step-by-step explanation:
just took the test on edge
 
        
                    
             
        
        
        
They will have games on the same day in 21 days