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Draw truth table of full sub tractor and realize it using 3:8 decoder.

Solution:

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Deci A B Cin Diffr Borrw
0 0 0 0 0 0
1 0 0 1 1 1
2 0 1 0 1 1
3 0 1 1 0 1
4 1 0 0 1 0
5 1 0 1 0 0
6 1 1 0 0 0
7 1 1 1 1 1

Diff = f(A, B, Cin) = $\sum$ m (1,2,4,7)

Borrow = f (A, B, Cin) = $\sum$m (1,2,3,7)

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