Digital Electronics
NAND. gates are preferred over others because these

can be used to make any gate
have lower fabrication area
consume least electronic power
provide maximum density in a chip.

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

0 any input causes the output to be at logic 0
1 at any input causes the output to be at logic 1
0 at any input causes the output to be at logic 1.
1 at any input causes the output to be at logic 0

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