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Question

Which of the following is/are a function?

A
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B
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C
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D
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Solution

The correct option is C
By vertical line test.


Vertical line cuts the curve infinite times, so it is not a function.

Vertical line cuts the curve only one time, so it is a function.

Vertical line cuts the curve only one time, so it is a function.


Vertical line cuts the curve two times, so it is not a function.

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