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L1and L2 are two skew lines. How many ...

`L_1`and `L_2` are two skew lines.
How many lines joining `L_1` and `L_2` can be drawn such that the line is perpendicular to both `L_1` and `L_2`?

A

exactly one

B

exactly two

C

infinitely many

D

(there cannot be a line joining two skew lines such that it is perpendicular to both)

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