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Solution 1) AB ll CD by alternate interior angles are equal i.e. Angle ABC = Angle BCD.
2)CD ll EF by co-int. angle as there sum is 180 degree.
3) If AB ll CD and CD ll EF then AB ll EF.
2)CD ll EF by co-int. angle as there sum is 180 degree.
3) If AB ll CD and CD ll EF then AB ll EF.
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