how to identify skew lines in a equation r=a+tb

Daer Satyadev,

Follow following steps while checking for SKEW lines.

Step 1: Two nonparallel lines in space that do not intersect are called Skew lines.
Step 2: Among the pairs, the lines  and  are nonparallel and lie in different planes, and do not intersect each other.
Step 3:  So,  and  are skew lines among the given pairs.

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