Answer:
The first gate is NAND gate. Its output \[\Upsilon \] is fed to a NOT gate (made from NAND gate). \[\therefore \]\[\Upsilon =\overline{A\,.\,B}\] and \[X=\bar{\Upsilon }=A\,.\,B\]
Hence the given circuit performs the function of an AND gate. The output waveform obtained at X is of the type shown below.
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