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Properties of Set Operation

Which of the ...

Question

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

A

1 only

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B

2 only

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C

1 and 2 only

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D

5 only

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E

All are required

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Solution

The correct option is E All are required
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.
All the informations are required.
Hence E is the correct option.

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