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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 !!!!!!!!
Dear student,
(200+7-1)C(7-1) = 206C6 (by n+r-1Cr-1)
ya i was getting the same answer but its not !!!!!! answer to this question is given as 206P6 in book !!
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