Explain excess-3 and gray code using four binary digitis, Computer Engineering

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Give the details of excess 3 codes and gray code using four binary digits.

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Table of excess 3 codes and gray code using four binary digits

Binary no	Excess3	Gray code
0 0 0 0	0 0 1 1	0 0 0 0
0 0 0 1	0 1 0 0	0 0 0 1
0 0 1 0	0 1 0 1	0 0 1 1
0 0 1 1	0 1 1 0	0 0 1 0
0 1 0 0	0 1 1 1	0 1 1 0
0 1 0 1	1 0 0 0	0 1 1 1
0 1 1 0	1 0 0 1	0 1 0 1
0 1 1 1	1 0 1 0	0 1 0 0
1 0 0 0	1 0 1 1	1 1 0 0
1 0 0 1	1 1 0 0	1 1 0 1
1 0 1 0		1 1 1 1
1 0 1 1		1 1 1 0
1 1 0 0		1 0 1 0
1 1 0 1		1 0 1 1
1 1 1 0		1 0 0 1
1 1 1 1		1 0 0 0

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