There are 10 stations on a certain relway line. How many different kinds of tickets of class IInd must be printed in order that a passenger mayh go from one station to any other by purchasing ticket?
A
90
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B
45
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C
135
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D
100
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Solution
The correct option is A 90 A passanger from any station may purchase ticket for anyone of the othre 9 stations. Therefore, there must be 9 tickets in each station. Therefore total number of different tickets =9×10=90