Question: with the user-defined subroutines prod and sum passed as calling arguments. Notethat the dummy argument sub is declared as EXTERNAL in subroutine subs_ as_arguments, and

with the user-defined subroutines prod and sum passed as calling arguments. Notethat the dummy argument sub is declared as EXTERNAL in subroutine subs_ as_arguments, and that the actual subroutines prod and sum are declared external in the main program.

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