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How many NAND gates are used to form an AND gate

$(a)\;1 \\ (b)\;2 \\ (c)\;3 \\ (d)\;4 $
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two NAND gates are required $Y= \overline{\bar {AB}. \bar {AB}}=AB$
Hence b is the correct answer.
answered Jan 29, 2014 by meena.p
 
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