Question: Let A = [2, 1) {3} (4, 5) (5, 7]. (a) Prove that 3 bdA. b) Prove that 5 bdA. (c) Prove that (2, 1)

Let A = [2, 1) {3} (4, 5) (5, 7].

(a) Prove that 3 bdA.

b) Prove that 5 bdA.

(d) Determine intA and bdA. You do not need to prove your answer. (Although some justification and/or pictures may be helpful for your own understanding!) (e) Let B = A Q. Determine whether 0 is contained in intB or bdB. Justify your answer.

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