Question: Are They Vector Spaces? In each of Problems 1-3, decide whether or not the given set constitutes a vector space. Assume standard definitions of the

Are They Vector Spaces? In each of Problems 1-3, decide whether or not the given set constitutes a vector space. Assume "standard" definitions of the operations?
1. The set of vectors in the first quadrant of the plane?
2. The set of vectors in the first octant of (x, y, z) space?
3. The set of all pairs of real numbers (x, y) such that x ( y?

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