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Option 1 : 20
1. Mayank remembers that the examination is after 18th December but before 21st December
→ The examination date is 19th, 20th December.
2. Suraj remembers that the examination is before 24th December but after 19th December
→ The date of examination is 20th, 21st, 22nd, 23rd December
Thus the actual date of examination is 20th December.
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