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JEE MATHEMATICS MCQ: PERMUTATIONS

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Application +4 | -1

Seven different lecturers are to deliver lectures in seven periods of a class on a particular day.

A, B

and

C

are three of the lecturers. The number of ways in which a routine for the day can be made such that

A

delivers his lecture before

B

and

B

before

C

, is

View answer and explanation

Correct option: D

None of these

The correct answer is None of these because the number of ways to arrange the lectures with A before B and B before C is 840.

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