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

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

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

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

3.f={(20,5),(20,10),(30,10)}

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

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