1.

If the functions f(x) and g(x) are defined on R rarr R such thatf(x)={:{(0, x in " rational "),(x, x in " irrational ") :}g(x)={:{(0, x in " irrational ") ,(x, xin" rational "):} then (f-g)(x) is

Answer»

one-one and onto
neither one-one nor onto
one-one but not onto
onto but not one-one

Answer :A


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