A combinational switching circuit has four inputs (A, B, C, D) and one output (F).
F = 0 iff three or four of the inputs are 0.
(a) Write the maxterm expansion for F.
(b) Using AND and OR gates, find a minimum three-level circuit to realize F (five gates, 12 inputs).
The answer of the above question include complicated equations and Diagrams.It is difficult to write it there. You can find the answers in deatailed way in the attached files.