4. SN+O+W

7.

5. second

6. VR+C

The diagram above is an example of second-order logic, an OR

circuit supplying an AND circuit. The output of each logic symbol

must be determined in order to develop an output Boolean

expression correctly. Start with the inputs to the first symbol and

proceed to the final output as indicated. Use the output of each

logic symbol as an input to the next symbol. Notice that the output

A+B of the OR gate (step 1) is put in parentheses in the final

output Boolean expression. It is enclosed in parentheses to

indicate that the complete quantity (A+B) is ANDed with CD.

Write the output Boolean expression for the second-order-logic

diagram below consisting of an OR circuit supplying an AND

circuit.