Hello: I would like to say "Fill in the correct formulas and values," but feel uncomfortable saying any of the following three alternatives: 1. "Rellena los fórmulas y valores correctos" because "los fórmulas" sounds strange to me (but my guess is that this may be correct) 2. "Rellena las fórmulas y valores correctos" because "las" and "correctos" are of the opposite gender. 3. "Rellena las fórmulas y valores correctas" because "correctas does not match "valores". Do I need the definite article for both in this case, as in "Rellena las fórmulas y los valores correctos"? Otherwise which, if any, is the correct alternative?