A college planned to conduct an education fair. The college invited foreign…
2026
A college planned to conduct an education fair. The college invited foreign universities to participate in the fair so that students could learn about them. The courses offered by these universities are Social Science, Psychology, Medicine, Commerce, Astronomy, Computer Science, and Architecture. The fair will start on Monday and end on Sunday of the same week. The Social Science stall will be set up immediately before the Medicine stall. The Medicine stall will not be set up on Tuesday or Thursday, while the Psychology stall will not be set up on Saturday or Sunday. There will be a gap of one day between the Astronomy stall and the Medicine stall. The Architecture stall will be set up immediately after the Astronomy stall. The Computer Science stall will be set up on Monday. Which of the following stalls will be set up immediately after the Computer Science stall?
- A.
Medicine
- B.
Commerce
- C.
Social Science
- D.
Psychology
Attempted by 3 students.
Show answer & explanation
Correct answer: C
Concept: Scheduling/sequencing puzzles like this are solved by first fixing any FIXED positions and DIRECTIONAL/adjacency rules (immediately-before, immediately-after, a fixed day), then testing each remaining possibility against the RESTRICTION rules (day exclusions, gaps) until exactly one complete week satisfies every constraint at once.
Computer Science is fixed on Monday.
Social Science is immediately before Medicine, and Medicine cannot be on Tuesday or Thursday, so with Monday already taken, Medicine's only candidates are Wednesday, Friday, Saturday, or Sunday — pairing Social Science with Tuesday, Thursday, Friday, or Saturday respectively.
Astronomy and Medicine have a gap of exactly one day between them, and Architecture sits immediately after Astronomy — apply this to each Medicine candidate in turn.
If Medicine = Wednesday (so Social Science = Tuesday): the one-day gap puts Astronomy on Monday or Friday; Monday is already taken by Computer Science, so Astronomy = Friday, and Architecture = Saturday.
The remaining days, Thursday and Sunday, go to Psychology and Commerce. Psychology cannot fall on Saturday or Sunday, so Psychology = Thursday and Commerce = Sunday. Every constraint is satisfied — this is a complete, valid week.
If Medicine = Friday (Social Science = Thursday): Astronomy would need to be Wednesday or Sunday. Astronomy = Wednesday would push Architecture onto Thursday, which is already taken by Social Science; and Astronomy = Sunday leaves no day at all for Architecture, since Sunday is the last day of the fair — no valid week results either way.
If Medicine = Saturday (Social Science = Friday): Astronomy would be Thursday, pushing Architecture onto Friday, which clashes with Social Science — no valid week results.
If Medicine = Sunday (Social Science = Saturday): Astronomy would be Friday, pushing Architecture onto Saturday, which clashes with Social Science — no valid week results.
Cross-check: Only the Wednesday-Medicine week survives every rule. Re-checking it: Medicine (Wednesday) avoids Tuesday and Thursday; Astronomy (Friday) and Medicine (Wednesday) have exactly Thursday between them, a one-day gap; Architecture (Saturday) is immediately after Astronomy (Friday); and Psychology (Thursday) avoids Saturday and Sunday.
Result: So Computer Science (Monday) is immediately followed by Social Science (Tuesday).
Day | Course |
|---|---|
Monday | Computer Science |
Tuesday | Social Science |
Wednesday | Medicine |
Thursday | Psychology |
Friday | Astronomy |
Saturday | Architecture |
Sunday | Commerce |