0 -4 0 3 -2 6 by a1, a2, az and W 1. 4. Let A and b= Denote the columns of A span{a, az, a3}. (a) Is b in W? How many vectors are in W? (b) Is b in the set {a, a2, a3}? How many vectors are in {a1, a2, a3}?

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