Army Group X Practice Set 3

f:N→I
f(1)=0,f(2)=−1,f(3)=1
f(4)=−2,f(5)=2
f(6)=−3 and so on.
In this type of function, every element ofset A has unique image in set B andthere is no element left in set B. Hence , fis one-one and onto function.