Let P={10,20,30} and Q={5,10,15,20}. Which one of the following functions is one – one and not onto?

f={(10,5),(10,10),(10,15),(10,20)}

f={(10,5),(10,10),(20,15),(30,20)}

Let P={10,20,30} and Q={5,10,15,20}. Which one of the following functi

1.	Let P={10,20,30} and Q={5,10,15,20}. Which one of the following functions is one – one and not onto?
A.	f={(10,5),(10,10),(10,15),(10,20)}
B.	f={(10,5),(20,10),(30,15)}
C.	f={(20,5),(20,10),(30,10)}
D.	f={(10,5),(10,10),(20,15),(30,20)}
Answer» C.