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Option 3 : 48th
The correct answer is option 3 i.e. 48th
Using the given information,
[ alt="F2 Taniya Deepak 08.11.2019 D11 (1)" src="//storage.googleapis.com/tb-img/production/19/11/F2_Taniya_Deepak_08.11.2019_D11%20%281%29.png" style="width: 270px; height: 38px;">
The number of students before Rohan is 22;
Therefore, after interchanging the positions of Garima and Seema, the people between them is 70 - (23 + 20) = 27;
So, the position of Rohan from the right end is 70 - 22 = 48.
Hence, the correct answer is 48th
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