Write the truth table for a NAND gate connected as given in figure. Hence identify the exact logic operation carried out by the

B is the output of AND gate and input of NOT gate.
So, for input A and output Y, the table is

Here, it is same as NOT gate, so the logic operation is carried by this circuit as NOT gate

Write the truth table for a NAND gate connected as given in figure. Hence identify the exact logic operation carried out by the circuit.