1. ABCDNumber 0000 0 0001 1 0010 2 0011 3 0100 4 0101 5 0110 6 0111 7 1000 8 1001 9 0 = Off 1 = On Binary Coded Decimal (BCD)

2. ABCD 0110 ABCD 1001

3. Output is G1 BCG1 000 011 101 111 Truth Table for ‘B OR C’ Input is B, C

4. ABCD 0110 ABCD 1001 Binary Coded Decimal (BCD) B C 0 1 Scrap paper

5. Output is G1 BCG1 000 011 101 111 Truth Table for ‘B OR C’ Input is B, C 0 1

6. Output is G1 BCG1 000 011 101 111 Truth Table for ‘B OR C’ Input is B, C

7. 1 is G1

8. D e 000 010 100 111 Truth Table for ‘D AND G1’ Input is D, G1 Output is e

9. ABCD 0110 ABCD 1001 Binary Coded Decimal (BCD) D G1 1 Scrap paper

10. DG1 e 000 010 100 111 Truth Table for ‘D AND G1’ Input is D, G1 Output is e 1

11. DG1 e 000 010 100 111 Truth Table for ‘D AND G1’ Input is D, G1 Output is e

12. Switch is ON is 1 e

13. Seven-Light Display Number (6) ABCD a b c d e f g b c a d f e g 0011 0011 ON