It is desired to design a BCD to seven-segment LED display decoder for a simplified display that displays only the digirs 1,2,3,4. The seven LED segment signals, a,b,c,d,e,f,g, can be expressed as combinational logic functions of the simplified 3-bit BCD binary codes, [A,B,C], representing the decimals 1,2,3,4. The conventions of the seven LED segments were discussed in unit-4. The truth table for the 3 -bit ABC binary inputs to the seven segnent outputs is as follows, where the x 's denote "don't care" entries because only the digits 1,2,3,4 are relevant, Using K-maps, the combinational logic functions for the segments {c,g} are found to be: e=BC,g=C+Ir e=BC,g=C+B e=BC,y=C+B e=BrC,g=C+B