Sarthaks Test
0 votes
in Mathematics by (70.5k points)

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

+1 vote
by (75.6k points)
selected by
Best answer

Correct option: (d) none of these


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

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.