Flag Algebra> Permutation and combination...
question mark

A conference attended by 200 delegates is held in a hall. The hall has 7 doors,marked A,B,......,G. At each door,an entry book is kept and the delegates entering through that door sign in it in the order in which they enter . If each delegate is free to enter any time and through any door he likes, how many different sets of seven lista would arise in all ? (Assume that every person signs only at his first entry)

i) 206C6 ii) 199P5 iii) 199C5 iv) 206P6

plzzz xplain !!!!!!!!

saurabh koshti , 14 Years ago
Grade Upto college level
anser 2 Answers
SAGAR SINGH - IIT DELHI

Last Activity: 14 Years ago

Dear student,

(200+7-1)C(7-1) = 206C6 (by n+r-1Cr-1)

saurabh koshti

Last Activity: 14 Years ago

ya i was getting the same answer but its not !!!!!! answer to this question is given as 206P6 in book !!

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments