In the following figure, a transversal c intersects two parallel lines a and b at A and B respectively and the angles formed at A and B are marked. Tell which of the following pairs of angles need not be equal.

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In the following figure, a transversal c intersects two parallel lines a and b at A and B respectively and the angles formed at A and B are marked. Tell which of the following pairs of angles need not be equal. <br><img src=https://i2.wp.com/farm2.staticflickr.com/1959/31547060688_0a50300a91_o.jpg?resize=242%2C190&ssl=1" alt=" Lines and Angles ">"