Math, asked by priyaksrSophia7320, 1 year ago

Seven different lecturers are to deliver lectures in seven periods of a class on a particular day. A, B, C are the three lecturers. The number of ways in which the routine for the day can be made such that A delivers his lecture before B and B before C is-
a) 420
b) 120
c) 210
d) 840

Answers

Answered by mkrishnan
7

A,B,C take their places in 7C3 =35 ways

remaining 4 take their places

in 4! =24ways

total =35x24=840

Answered by amitnrw
5

840 Ways in which the routine for the day can be made such that A delivers his lecture before B and B before C if Seven different lecturers are to deliver lectures in seven periods of a class on a particular day

Step-by-step explanation:

There are total 7 Lectures

A , B & C will deliver 3 Lectures

as order is A delivers his lecture before B and B before C

Hence 3 Lectures out of 7 lectures can be selected in

⁷C₃  =  35 Ways

Remaining 4 Lectures and 4 Lecturers can be arranged in

⁴P₄ = 4!  = 24 Ways

Total Ways = 35 * 24  = 840

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