Question

Let A and B be subsets of a vector space V . Check the box(es) corresponds to which true statements are given.
1)
If A is a proper subset of B, then span (A) is a proper subset of span(B).

2).
span(A) = span(B) if and only if A=B .

3).
If span (A)=V and A⊆B , then span (B)=V .

4).
A is a subspace of V if and only if span(A)=A.
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Answer 1

Answer:

3 ) if span(a)= v and ....(B)=V