A⊕ C = B
B⊕ C = A
A⊕ B⊕ C = 0
Both (a) & (b)
Vcc
Gnd
Pin 14
Pin 1
31
10
127
1023
difference of the previous bits
sum of all previous bits
carry from ( K - 1 )THbit
sum of previous bit
A-1 B-2 C-3
A -3 B-4 C-1
A-5 B-4 C-2
A-1 B-3 C-5