For any r ER, r > 0, define A, = {z € R| - r < x < ² } = (-r, ²). Compute the following unions and intersections. Use interval notation, for example [0,1), (-inf,3]. (for empty set), etc. 1. If I = {r € R | r ≥ 1} then (a) Urc Ar= (-inf,0) (b) relAr= (-1,0)

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