Question

why NAND gate is called a universal gate?​

Answer 1

Answer:

this is becoz combinations of them can be used to establish and accomplish any basic operation like an inverter,OR operation etc..

Explanation:

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Answer 2

The NAND gate and the NOR gate can be said to be universal gates since combinations of them can be used to accomplish any of the basic operations and can thus produce an inverter, an OR gate or an AND gate. The non-inverting gates do not have this versatility since they can't produce an invert.