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Question

For every line L and for every point P not lying on a given line L, there exists _____________ passing through P and parallel to L.

A
no line
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B
a unique
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C
two lines
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D
infinitely many lines
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Solution

The correct option is C a unique
The answer is B i.e., a unique line.
It is based on the Playfair axiom.
In geometry, Playfair's axiom is an axiom that can be used instead of the fifth postulate of Euclid (the parallel postulate):
In a plane, given a line and a point not on it, at most one line parallel to the given line can be drawn through the point.

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Euclid's parallel postulate and Playfair's axiom
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