Boolean Mathematics

0=0000

1=0001

2=0010

3=0011

4=0100

5=0101

6=0110

7=0111

8=1000

9=1001

0+0=0

0+1=1

1+1=0 add 1 to left column

 

 

1+3=4

1=0001

3=0011

4=0100


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