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Seven different lecturers are to deliver...

Seven different lecturers are to deliver lectures in seven periods of a class on a particular day X,Y and Z are three of the lecturers . The number of ways in which a routine for the day can be made such that X delivers his lecture before Y and Y before Z , is :

A

420

B

120

C

210

D

None of these

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The correct Answer is:
D
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