The question appears to be asking for a computation involving vectors, but lacks specifics on what operation to perform. Vector operations require clear instructions to provide an accurate answer.
The question seems to be related to vector computation in mathematics. However, there might be a typo or a missing part in the original question, as it states 'ompute the following vectors' without specifying what kind of computation is needed (e.g., addition, subtraction, scalar product, cross product, etc.). Based on the given vectors vec (a), vec (b), and vec (c), we could potentially perform various vector operations if more context were provided. Without additional information, we can determine that vec (a) and vec (b) differ by their third component, and vec (c) is not parallel to either vec (a) or vec (b).
In vector operations, knowing the exact calculation to perform is crucial. It could be anything from finding the magnitude, direction, scalar product (dot product), vector product (cross product), or sum and difference of the mentioned vectors.
However, without the specific operation in question, providing a answer or a detailed explanation is not possible at this time.