Q.

The combinations of four NAND gates represent

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a

AND gate

b

OR gate

c

NOR  gate

d

XOR gate

answer is D.

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Detailed Solution

out put of the combination can be written as A AB¯¯  B AB¯¯¯ =A AB¯  + B AB ¯ =AB¯ (A+B)  =( A ¯+B¯)  (A+B )  =A¯ B + A B¯   which is output of XOR
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The combinations of four NAND gates represent