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Option 2 : Economics
2. Physics paper is on Monday.
| Monday | Physics |
| Tuesday | |
| Wednesday | |
| Thursday | |
| Friday | |
| Saturday |
3. Geography paper is not on the last day.
| Monday | |
| Tuesday | |
| Wednesday | |
| Thursday | |
| Friday | |
| Saturday |
1. Maths paper is after the Chemistry paper, with a 1-day gap between them.
| Chemistry |
| Maths |
4. History paper, which is scheduled on the previous day of the Maths paper, has a two-day gap with the Physics paper.
Case 1.
| History |
| Maths |
| Physics |
Case 2.
| Physics |
| History |
| Maths |
On combining (4) and (2)
We can eliminate Case 1st of 4 because Physics is on Monday and in Case 1st, there are three exams.
| Monday | Physics |
| Tuesday | |
| Wednesday | |
| Thursday | History |
| Friday | Maths |
| Saturday |
On combining (1), (4) and (2)
| Monday | Physics |
| Tuesday | |
| Wednesday | Chemistry |
| Thursday | History |
| Friday | Maths |
| Saturday |
On combining (1), (2), (3) and (4)
Geography is not on Saturday than only left day is Friday.
Economics is only subject left than it will be on Saturday.
| Monday | Physics |
| Tuesday | Geography |
| Wednesday | Chemistry |
| Thursday | History |
| Friday | Maths |
| Saturday | Economics |
Economics paper is on Saturday.
Hence, the correct answer is "Saturday".
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