"Show that the function `f: N-N` given by `f(1)=f(2)=1` and `f(x)=x-1` for every `xgeq2`
Channel: Doubtnut
Date: 2020-06-28

"Show that the function `f: N-N`
 given by `f(1)=f(2)=1`
 and `f(x)=x-1`
 for every `xgeq2`
 , is onto but not
 
  one-one."