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All digital circuits can be realized using only

1. Ex-OR gates
2. AND, OR gates
4. OR gates

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All digital circuits can be realized using 'ONLY' i.e. Which of the following is Functionally Complete.
Obviously we can realize any circuit with the help of Half Adder.
whats wrong witn and and or gate ?
by

Try to implement $\overline{A+B}$ with these two only.
So you mean not gate is not given that's why we can't realise all functions?

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