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Which of the following logic gate is an universal gate

$(a)\;OR\;gate \\ (b)\;NOR\;gate \\ (c)\;NOT\;gate \\ (d)\;AND \; gate$
Can you answer this question?

NOR gate is considered universal gate as all other gates can be obtained by multiple use of NOR gate.
Hence b is the correct answer.
answered Jan 31, 2014 by