Combinational circuits are logic gates whose outputs are determined by the present combination of inputs. They are also known as decision-making circuits that receive binary inputs from an external source and produce outputs to an external destination, with one unique output combination for each of the 2^n possible input combinations.

2.  consists of logic gates whose outputs at any time are determined
from the present combination of inputs
 also known as decision-making circuits
 receives n binary inputs from an external source and produces m
output variables that go to an external destination
 for n input variables there are 2n possible combinations
 one and only one possible output combination for every possible
combination of inputs

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