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Question

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


A
1
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B
2
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C
3
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D
4
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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
$$\overline{\overline{A.B}.\overline{A.B}}=\overline{\overline{A.B}}+\overline{\overline{A.B}}=A.B$$

498261_463364_ans.png

Physics

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