"Wir haben drei Produkte."

Translation: We have three products.

[CaveatEmptor]

So the plural here is ProduktE. But in the previous exercise it was ProduktEN. Is one of these a mistake?

[ghfhfgffhjhfj]

"Produkte" (accusative plural) in the above sentence is correct. "Produkten" in the other sentence was also correct if the noun was dative plural.

In the dative plural, all nouns add an -(e)n. The only exception are nouns whose nominative plural ends in -n (e.g. die Frauen) or in -s (e.g. die Autos).

See:
http://german.about.com/library/blcase_dat.htm

[CaveatEmptor]

Oh yeah, I forgot about that. Thanks!