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How many numbers of 5 digits can be form...

How many numbers of 5 digits can be formed with the digits 0,2,5,6,7 without taking any of these digits more than once.

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Clearly from any station one may travel to any of the 12 other stations. So, from any of the 13 stations there must be 12 different single third class tickets. Hence the number of different kinds of single third class tickets to be printed is `13xx12=156`.
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