Final answer:
If a set contains fewer vectors than there are entries in the vectors, then the set is not linearly independent.
Step-by-step explanation:
A set with fewer vectors than there are entries in the vectors is called an underdetermined system, and it is not linearly independent. A set of vectors is linearly independent if none of the vectors in the set can be expressed as a linear combination of the others. In an underdetermined system, there are more unknowns than equations, so there are infinitely many solutions, meaning the system is dependent and not independent.