Final answer:
The Python code 'score = 3 + "45"' will result in a TypeError because it tries to add an integer with a string without converting one to the type of the other.
Step-by-step explanation:
When the Python code score = 3 + "45" is executed, it will result in a TypeError. This is because the operation is attempting to add an integer, 3, with a string, "45". Python does not automatically convert between these data types for arithmetic operations. To successfully perform the addition, both values must be of the same data type. If we want to add these two values as numbers, we should convert the string to an integer using int() like this: score = 3 + int("45"). Otherwise, to concatenate them as strings, we should convert the integer to a string using str(): score = str(3) + "45". Without such a conversion, the code will raise a TypeError.