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Mathematics 18 Online
OpenStudy (anonymous):

There are 10 stations on a railway line. The number of different journey tickets that are required by the authorities is

OpenStudy (king):

1?

OpenStudy (anonymous):

no, seems to be 90, not sure how

OpenStudy (anonymous):

Yes, it's 90.

OpenStudy (king):

how FFM?

OpenStudy (anonymous):

they have to make 9 different ticktes for each station..9*10=90

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