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 f(a,b,c) = Summation(0,1,2,5)

 Truth Table

 a  b  c  |    f

 0  0  0  |    1

 0  0  1  |    1

 0  1  0  |    1

 0  1  1  |    0

 1  0  0  |    0

 1  0  1  |    1

 1  1  0  |    0

 1  1  1  |    0

 The function f = a'b'c' + a'b'c + a'bc' + ab'c

 *************************************************************

 Implementation using 8:1 Multiplexer

 Inputs of Multiplexer are denoted by D0,D1,D2,D3,D4,D5,D6 and D7

 Select Lines of Multiplexer are denoted by S2,S1,S0

 Input and Select Line assignment

  D0 = 1, D1 = 1, D2 = 1,D3 = 0, D4 = 0, D5 = 1, D6 = 0, D7 = 0

  S2 = a, S1 = b, S0 = c

 *************************************************************

 Implementation using 4:1 Multiplexer

 Inputs of Multiplexer are denoted by D0,D1,D2,D3

 Select Lines of Multiplexer are denoted by S1,S0

 Input and Select Line assignment

  D0 = 1, D1 = c', D2 = c ,D3 = 0

  S1 = a, S0 = b