question_answer 29)

Let  be defined as f(x) = 3x, choose the correct answer (a)   f is one-one onto (b)   f is many-one onto (c)   f is one-one but not onto (d)   f is neither one-one onto.  

Answer:

Let x1, x2 be any two elements of R.                              for every x1 = x2              is one-one       Also, for any           for every  there exists  such that  is onto  is correct.