Question 46
EasyOriginal questionA college holds six guest lectures in one week, one on each day from Monday to Saturday. The speakers are Ananya, Bhaskar, Charu, Devesh, Elango and Firdaus, and each speaks on a different topic: Astronomy, Banking, Law, Nutrition, Poetry or Robotics. 'Before' or 'after' means on any earlier or later day; 'immediately before' or 'immediately after' means the previous or the next day. The following is known:
1. The lecture on Astronomy is on Tuesday.
2. Ananya speaks on Poetry, on the day immediately after the Astronomy lecture.
3. Devesh gives the last lecture of the week, and his topic is not Robotics.
4. Exactly two lectures are held between Charu's lecture and Elango's lecture.
5. Bhaskar speaks on Law, on some day after Elango.
6. Charu speaks on neither Nutrition nor Robotics.
7. The Robotics lecture is held on the day immediately before the Law lecture.
On which day of the week does Firdaus give his guest lecture?
Show the answer and explanation
Correct answer: B
Explanation
Astronomy is on Tuesday, so Ananya (Poetry) is on Wednesday (clues 1 and 2). Devesh is on Saturday (clue 3).
Charu and Elango are three days apart on the free days Monday, Tuesday, Thursday and Friday: Monday and Thursday, or Tuesday and Friday. Bhaskar is after Elango (clue 5), so Elango is not on Friday.
If Elango is on Tuesday, Bhaskar (Law) must be on Thursday, making Wednesday the Robotics day (clue 7), but Wednesday is Poetry. If Elango is on Monday and Charu on Thursday, Bhaskar is on Friday and Robotics falls on Thursday, Charu's day, against clue 6.
So Charu is on Monday, Elango on Thursday (Robotics), Bhaskar on Friday (Law) and Firdaus on Tuesday (Astronomy). Charu does not take Nutrition, so Charu takes Banking and Devesh Nutrition.
Firdaus speaks on Tuesday.
- Concept
- Placing speakers on days by case splitting
- Typical timeTypical
- 45 s
- Your timeYours
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