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Q.

How many minimum NAND gates are used to make OR gate?

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answer is 3.

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Detailed Solution

How to Build an OR gate from a NAND Gate

The first two NAND gates are operated as NOT gates and their output are fed to the third. The resulting circuit is OR gate. Here, three gates are used
So, the correct answer is (3).

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How many minimum NAND gates are used to make OR gate?