2. Prove that if A₁. An... is a countable collection of countable sets (i.e. VnEN A,, is countable), then UA₁ #+1 is also countable.

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A: The roots are calculated by bisection method as shown below.

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Q: College radio surveyed 215. Make a Venn diagram is 26 like classical, 145 like rap and 171 like both

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Q: 789-90

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