In the provided scenario, varA is assigned the string value '123' and varB is assigned the integer value 123. When the Write Line activity concatenates 'varA + varB' and 'varB + varA', the operations are as follows: 'varA + varB' results in the string '123123' since varB is converted to a string and concatenated with varA. Similarly, 'varB + varA' results in '123123' for the same reason. Therefore, the output of the Write Line activity when combining both results is '123123123123'.