Answer:
It should be 10 raised to power 2 which is a hundred.
 
        
             
        
        
        
Answer:
b
Step-by-step explanation:
 
        
                    
             
        
        
        
The number of permutations of the 25 letters taken 2 at a time (with repetitions) is:

The number of permutations of the 9 digits taken 4 at a time (with repetitions) is:

Each permutation of letters can be taken with each permutation of digits, therefore the total number of possible passwords is:
 
 
        
        
        
Answer:
The answer is A,C, and D
Step-by-step explanation:
 
        
             
        
        
        
(A) The print area is 4/10 × 100% = 40% of the total, so the ad area is ...
... 100% - 40% = 60% of the print area
(B) News : Ads = (40%) : (60%) = 2 : 3