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Best answer
14 votes
14 votes

Need only 3 NAND Gate : A+B = ((A + B)')' = ( A' .B' )'

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5 votes
5 votes
  by using NAND by using NOR
NOT 1 1
OR 3 2
AND 2 3
NAND - 4
NOR 4 -
EX-OR 4 5
EX-NOR 5 4

so by using 3 NAND gate we can perform OR gate operation

edited by
3 votes
3 votes
Gate Min NAND MIn NOR
AND 2 3
OR 3 2
NAND 1 4
NOR 4 1
EX-OR 4 5
EX-NOR 5

4

For NOT gate only 1 NAND & NOR gate are enough to realize.

& IF from 2 Input NAND gate we want to realize n-input NAND gate then it will be 2n-3. 

Answer:

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