The set of all possible vectors you can reach with the linear combination of two vectors is called

The set of all possible vectors you can reach with the linear combination of two vectors is called the linear span of the set of two vectors.  

We often write the span of a set of vectors S as span(S) and it's itself a vector space, a subspace of the vector space from which the elements of S are drawn.

there would only be 50 odd numbers between 1 and 100 so therefor there would be 50 even so that would only be 50 odd numbers.