Table and chairs

Four people should sit at a table in front of a row of 7 chairs. What is the probability that there will be no empty chair between them if people choose their place completely at random?

Correct result:

p =  0.1143

Solution:

C4(7)=(74)=7!4!(74)!=765321=35  n1=(74)=35 n2=4 n3=0 p=n2/n1=4/35=435=0.1143



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