4.There exist 20 stations between cities of A and B (the satiations in A and B are not counted). Tickets will be issued for those stations. a.How many one way tickets will be issued? b.How many two way ticket will be issued?

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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4.There exist 20 stations between cities of A and B (the satiations in A and B are not
counted). Tickets will be issued for those stations.
a.How many one way tickets will be issued?
b.How many two way ticket will be issued?
Transcribed Image Text:4.There exist 20 stations between cities of A and B (the satiations in A and B are not counted). Tickets will be issued for those stations. a.How many one way tickets will be issued? b.How many two way ticket will be issued?
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