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NAND means we require AND-OR combination but the given expression is in OR-AND so complement the expression, hence one NAND gate for this, now after complementing the expression becomes f ' = (x ' + y ' ) ' + ( z + w ) ' =(xy)+(z'w') this is of the form AND-OR realization and requires 3 gates. Hence in all we require 4 NAND gates.
Correct if wrong.
Ans is 4
F = (x' + y')(z + w)
=(xy)c(z+w) take (xy)c=P
=Pz + Pw
and Nand -nand reliazation is (And Or ) reliazation
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