792257
792257
28-12-2017
Mathematics
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So many similar questions.....
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icedipping
icedipping
28-12-2017
In a function, every point is mapped to at most one other point. B is the answer.
In A, -1 maps to 2 points.
In C, 3 maps to 2 points.
In D, 2 maps to 2 points.
So they are not functions.
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