1.

E and F are mid-points of sides of AD and BCrespectively of quadrilateral ABCD having vertices A(1, 2, 1), B(-2, 4, -1), C(-1, 3, 2), D(5, -1, 6), then

Answer»

EF is parallel to AB
EF is parallel to CD
EF is a parallel to AB and CD
EF is not a parallel to AB and CD

Answer :C


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