"An apple and an orange."
Translation:Et eple og en appelsin.
In most cases nothing about a noun itself will tell you what grammatical gender it has. Some pointers are if the noun refers to something which has a 'natural' gender: boy, man and bull are masculine; girl, daughter and cow are feminine. Words ending in -else, -sjon and -dom are masculine. Words ending in - ning referring to people are masculine. Words ending in -eri are neuter. There are a few more odd pointers like that but for the most part you just have to learn (the most likely arbitrary seeming) grammatical gender of each noun.