Question

To get an OR gate from a NAND gate, we need

• A. Two NOT gates obtained from NAND gates and one NAND gate
• B. None of the above
• C. Four NAND gates and two AND gates obtained from NAND gates
• D. Only two NAND gates

Answer 1

Answer: (A)

To obtain OR gate from NAND gates we need to NOT gates obtained from NAND gates and one NAND gate as figure.
Boolean expression $Y=\overline{A.B.}=\overline{A}+\overline{B}$
$=A+B,$ $OR$ gate