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pow:problem4f20

**This is an old revision of the document!**

Problem 4 (due Monday, October 26)

Jack and Jill play the following game which results in a 6 digit number:
Jill starts by picking a non-zero digit, the first digit of the number.
Then Jack and Jill alternate picking the next digits, each time they can
choose any digit which has not been used before. Jack wins if the 6
digit number is a prime, Jill wins otherwise. For example, suppose Jill picks 8, then Jack picks 0, then Jill
picks 9, then Jack picks 4, then Jill picks 6, and finally Jack picks 1.
We get the number 809461, which is a prime number, so Jack wins.
Which player has a strategy to win
regardless of how the other plays?

pow/problem4f20.1603768037.txt · Last modified: 2020/10/26 23:07 by mazur

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