1. The problem statement, all variables and given/known data A and B are both spans. A = span(a1,a2,a3) B = span(b1,b2) Then how many elements would AUB have? 2. Relevant equations N/A 3. The attempt at a solution I'm almost certain the answer is 2, with the two elements being span(a1,a2,a3) and span(b1,b2) but I'm unsure as to whether a span can be an element? Can someone verify this for me please. Thank you!