"The election of the President."

Translation: Η εκλογή του Προέδρου.

[Luke262856]

is της a possibility? or should it only ever be του? in the multiple choice it said i had to pick both answers

[JacobPast177]

Yes, it is both ο πρόεδρος and η πρόεδρος. Nouns of this type with one ending for both genders are usually professions: see here under paragraph B.4 Oυσιαστικά κοινού γένους.