The set contains the zero vector:
To check if the set contains the zero vector, we need to see if there exists a and b such that the vector is (0, 0, 0, 0).
(5a, b, -3a, -b) = (0, 0, 0, 0)
This is true when a = 0 and b = 0. So, the set contains the zero vector.
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