totod Criven We've 1(a, b) closure [a, b] Interior (a,b) boundary [a, b] Note that Some to Find the and boundary of those intervals. [a, b] u(a, b] union. y as the set [a, b]. A [a, b] intervals. [a, b] (a, b) {a,b} Date : closure, intercios [a, b] (a, b) {a,b} use in the thired question, we took Hence [a, b)u(a, b] is nothing. but 1

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