Q.Distinguish between combinational and sequential logic circuits.

In a combinational logic circuit the output at any instant depends only on the present inputs, with no memory; in a sequential logic circuit the output depends on both the present inputs and the past (stored) state, so it contains memory elements. …

[!TLDR]

Combinational circuits have no memory (output depends only on current inputs); sequential circuits have memory elements and a clock, so output depends on inputs and past state.

The two classes of digital circuits are distinguished by whether or not they remember past history.

Combinational logic circuit: the output at any moment is determined solely by the combination of inputs present at that moment. There are no memory elements and generally no clock; if the inputs are removed the output information is lost. Adders, subtractors, decoders, encoders, multiplexers and code converters are examples. …