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#Question id: 14910


If a function ‘f’ is defined on R by
f (x) = 1 for x a rational number
= - 1 for x an irrational number, then

#Section 1: Engineering Mathematics
  1. f (x) is continuous at x = 1
  2. f (x) is continuous at x = -1
  3. f (x) is continuous at x = 0
  4. f (x) is not continuous at any point

Answer:- Option(s): 4


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