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Since Sangeeta and Kamla interchange places, so Kamla's new position (32nd from left ) is the same as Sangeeta's earlier position (8th from right). So, number of students in the row = (31 + 1 + 7) = 39. Now, Sangeeta’s new position is the same as Kamla’s earlier position i.e., 20th from left. Therefore Sangeeta’s position from the right = (39 – 19) = 20th
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