Question

Let $A=\{x,y,z\},B=\{u,v,w\}$. Then the function $f:A\to B$ defined by $f\left(x\right)=u,f\left(y\right)=v,f\left(z\right)=w$ is

• A. Many-one into
• B. One-one into
• C. One-one onto
• D. Many-one onto

Answer 1

Answer: (C)

One-one onto

A function is one-one when every element of domain have a unique image in co-domain
And hence given function is one-one