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QUOTE: Originally posted by Big_Boy_4005 [#welcome] to the forum. An interesting queston about the deck of 100. Maybe the answer is put in 3, but 2 of them would be false positives, leaving only one actual defect per 100. The other 2 would force the crew to stop and check the train, then procede at reduced speed to the next detector. Your deck could consist of 97 green cards, 2 yellow, and one red. The red card would force the crew to set out the bad car at the nearest siding. If the yellow card came up, at the next detector there would be a 25% chance the car was actually bad. Instead of a special deck of cards, maybe percentile dice would be easier. Percentile dice are 10 sided, numbered 0 thru 9, and can be found at hobby stores that deal in war games or dungeons and dragons type fantasy games. Buy a pair, one each of 2 different colors. One is the ones digit the other the tens digit. Roll double zero, defect. Roll 98 or 99 possible defect. Next detector after a possible defect roll 1 thru 25 defect, but don't forget to roll for a new possible defect. You could also use the dice to determine which car was bad order. That actually sounds like fun!!![swg]