Question

$A=\{-1,0,1,2\},B=\{2,3,6\}$ . If $f(x)$ from A into B defined by $f(x)=x^2+2$, then f is

• A. a function
• B. one-one
• C. into
• D. one-one and onto

Answer 1

Answer: (A)

$f=\{(-1,3),(0,2),(1.3)(2,6)\}\Rightarrow f$ is not one,on but onto