Final answer:
Defaulted parameters should be positioned as the right-most in function definitions to ensure that arguments can be provided efficiently and the code remains clean and intuitive.
Step-by-step explanation:
Defaulted parameters in function definitions should ideally be the right-most parameters. This is because when calling a function with default values, the arguments are provided from left to right, matching the parameters in the function signature. If a default parameter is positioned to the left, it necessitates specifying all subsequent parameters, even if they have default values, thus negating the convenience of default parameters. Positioning default parameters to the right allows you to call the function with only the necessary arguments, making the code cleaner and more intuitive.