Q:-4 which of the following statement is false: a) let a c r. then a is open if and only if a = a"cinterior set of a) b) every countable set has no limit point.

Q:-4 Which of the following statement is false: a) Let A c R. Then A is open if and only if A = A"Cinterior set of A) b) Every countable set has no limit point. c)Every element of finite set is isolated point. d) Let A cR. Interior point of A is limit point of A Q:-5 Which of the following statement is false: a) Let A c R and A is non-empty bounded above set with supA = s'and s EA. Then s is limit point of A. b) Let A c R and A is non-empty bounded below set with infA = b'and b' EA. Then b' is limit point of A c) Let A c R and A is non-empty bounded above set with supA = s'. Then s' is limit point of A. d) None of these.