1. Find the interior, closure, and boundary of each of the following subsets of R. (a) [a,...
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1. Find the interior, closure, and boundary of each of the following subsets of R.
(a) [a,
b) where a < b.
(b) E = {lin: n EN}.
(c) E=U~=l(n:l'~).
(d) E=U~=l(-n,n).
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