A toggling can be done using a single logic circuit is:
a) AND gate
b)X-OR gate
c)X NOR gate
d)NOR gate
d) NOR Gate.
For inputs A and B, output Y of NOR gate is
Y = $\overline{A + B}$
Now for single input, let A = B
$\therefore$ Y = $\overline{A + A}$ = $\overline{A }$
Hence for input A, output is toggled.
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