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Step 1 of 1 4.048E Self-dual functions have to satisfy the following condition. In order to satisfy the condition the function F strictly gives same output value for half of the possible input combination. Otherwise we can say that if and only if the numbers of high and low outputs are equal it can be a - dual function. Hence, the function F while representing in standard form will have 2" minterms and hence, 2 it must have 2"⁻¹ minterms. Since in dual functions, positive high logic become negative low logic and vice versa. Complement of the output of minterms will occur for the next half. Output of the minterms can take combination. Each combination will produce a unique output function F. Hence, the possible self -dual functions are -