Assume that for every positive integer i, A₁ = (-i, i), that is the set of real numbers x with -i < x < i. a) Write the first 3 of these indexed sets. b) Determine A2 - A1, expressing the result using interval or set builder notations. c) Find U₁₁ A¿ and ſ₁₁ A¿

Let ai = [250] -10 and a2 = h [4] The set {a1, a2} will span R² unless h = (If there are no values of h that make the set fail to span, enter "NONE". If the set fails to span for all values of h enter "ALL".)