Let M={5,6,7,8} and N={3,4,9,10}. Which one of the following functions is neither one-one nor onto?

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Question:Let M={5,6,7,8} and N={3,4,9,10}. Which one of the following functions is neither one-one nor onto?

1.f={(5,3),(5,4),(6,4),(8,9)}

2.f={(5,3),(6,4),(7,9),(8,10)}

3.f={(5,4),(5,9),(6,3),(7,10),(8,10)}

4.f={(6,4),(7,3),(7,9),(8,10)}

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  1. Let M={5,6,7,8} and N={3,4,9,10}. Which one of the following functions is neither one-one nor onto?
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