Question

How many lectures are organised between C and D?

• A. None
• B. One
• C. Two
• D. Three
• E. None of these

Answer 1

The correct option is D Three

From fifth point we get, B is organised on Tuesday.

Now, D is followed by the day with no lecture.

D cannot be organised on Friday because then E will be on Tuesday (there is a gap of two days between D and E).

D cannot be organised on Thursday (because then, there will be no lecture Friday).

B cannot be followed by D. So, D will be organised on Sunday and E on Wednesday. No lecture will be organised on Monday. A cannot be organised on Thursday. So, A will be organised on Saturday. F and C will be organised on Thursday and Friday respectively.
So the correct order from Sunday to Saturday is
D $\to$ No lecture $\to$ B $\to$ E $\to$ F $\to$ C $\to$ A.

Clearly, three lectures are organised between C and D.