Answer: There are 24 possible sequences of assembly.
Step-by-step explanation:
Since we have given that
Number of wires which need to be attached to a circuit board = 4
We need to find the number of possible sequences of assembly that must be tested.
Using multiplication rule of counting we get that,
Number of possible sequences of assembly is given by
i.e. there are four choices for the first wire, three choices for the second wire, two choices for the third wire, one choice for the fourth wire.
Hence, there are 24 possible sequences of assembly.