Six lectures A, B, C, D, E and F are to be organised in a spam of seven days -- from Sunday to Saturday, only one lecture on each day in accordance with the following :

1. A should not be organised on Thursday.
2. C should be organised immediately after F.
3. There should be a gap of two days between E and D.
4. One day there will be no lecture (Friday is not that day), just before that day D will be organised.
5. B should be organised on Tuesday and should not be followed by D.

Which of the following informations is not required in finding the complete sequence of organisation of lectures ?

###### Option:
A. 1 only
B. 2 only
C. 1 and 2 only
D. 5 only
E. All are required
Answer: E . All are required

Justification:

B is organised on Tuesday. Now, D is followed by the day with nno 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). It 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 is :

 Sunday Monday Tuesday Wednesday Thursday Friday Saturday D x B E F C A

So, All the given statements are required.