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?

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135

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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 $= 9 \times 10 = 90$

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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?

The correct option is A 90A 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

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 $= 9 \times 10 = 90$