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The person who went to Bareilly has the same slot of the exam as that of Parul. Mayank as well as the female who went to Meerut went to take the exam in Slot 2. Using the above hints we can say that the two persons whose exam was in Bareilly and Meerut have their exam in the Slot 2 and person whose exam was in Meerut was a female she may be or may not be Parul but we can say that take her exam in Slot 2. The person who was second youngest went to an exam in Slot 3. The exam of the person who went to Haridwar was 1 slot earlier than that of the youngest person. The person who went to Ghaziabad didn’t take the exam in Slot 2. We can use the first hint easily in our table and after that with the second hint we can say that the person who was has his/her exam in Slot 2 and the person whose exam was in Haridwar has his/her exam in slot 1. And finally with the third hint we can say that whose exam was in Ghaziabad has his/her exam in Slot 3. At this point we can say that both the person whose exams were in Dehradun and Rampur has their exam in Slot 2. Now, the above table can be redrawn as: 
The person who went to take the exam in Slot 1 is younger than Swati but older than exactly two males. With the above hint we can say that Swati cannot be youngest. Therefore, Parul must be the female who went to Rampur and the youngest of all then Swati becomes the female who went to Meerut as there were only two females in the group. And we already know that Mayank took his exam in Slot 2 and at this point we can say that Mayank took his exam in Bareilly. 
Case 2: Shubham take his exam in Slot 1. 
Shubham is older than Ankit. Mayank was younger than Rahul. Here, our Case 1 is contradicting with the given hints as Ankit cannot be younger Shubham. So, we can say that this is an invalid case. But we have to possibilities for the ages of Rahul and Swati can be oldest or second oldest. 
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