Question

# How many NAND gates are required to form an AND gate?

A
1
B
2
C
3
D
4

Solution

## The correct option is B $$2$$Two NAND gates arranged as shown, would give an AND gate.Here output from first NAND gate is $$\overline{A.B}$$This, as input, is again fed to a NAND gate, giving$$\overline{\overline{A.B}.\overline{A.B}}=\overline{\overline{A.B}}+\overline{\overline{A.B}}=A.B$$Physics

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