Sarthaks Test
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Seven different teachers are to deliver lectures in seven periods of a class on a particular day. A,B and C are three of the teachers. The no.of ways in which a routine for the day can be made such that A delivers his lacture before B and B before C is _______

(a) 420 

(b) 120 

(c) 210 

(d) none of these

1 Answer

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Best answer

Correct option: (d) none of these

Explanation:

The order of a, b, c is not changing

Number of arrangement by keeping order of a,b,c as given = 7!/3! = 7 x 6 x 5 x 4 = 840

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