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Digital Dice by Paul J. Nahin

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12. How Many Runners in a Marathon?

In the Middle East a few years ago I was given permission by Israeli military authorities to go through the entire Merkava Tank production line. At one time I asked how many Merkavas had been produced, and I was told that this information was classified. I found it amusing, because there was a serial number on each tank chassis.

—a former military officer, thus proving that history still has lessons to teach, as the problem below explains

In any war, it is always of value to one side to have good intelligence ...

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