Question: 3. If {a, ..., a,} spans S and {b, ..., b,} spans S, prove that {a, ..., a, b, ..., b,} spans S S.
3. If {a₁, ..., a,} spans S₁ and {b₁, ..., b,} spans S₂, prove that {a₁, ...,
a, b₁, ..., b,} spans S₁ ⊕ S₂.
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