Question 7
Which of the following is the logical circuit that obtains the same results as
| _ | _ | _ | _ | ||||
| A | .B | + | A | .B | + | A. | B |
? In this example, 
denotes a logical product (AND); 
denotes a logical sum (OR); 
denotes a negative AND (NAND); and 
denotes a negative logical sum (NOR).
a) 
b) 
c) 
d) 
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