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Question

Which of the following is/are functions?

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 drawing the vertical line, we see


The vertical lines intersects the curve more than one time, so it is not a function.


The vertical lines intersects the curve one time only, so it is a function.


The vertical lines intersects the curve one time only, so it is a function.


The vertical line at certain place intersects the curve infinite times, so it is not a function.

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