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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Kanika goswami 1
all are having one one correspondence with N because all are countable sets. And by definition of countable sets it must have one one correspondence with N. So all are correct options.
ma'am why (0,1) - I is countable....
because it is subset of the set of rational no. Q. And Q is countable so (0,1)-I is also.....okay