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Jason is trying to remember the five digit combination to his safe. He knows that he only used digits 1 through 5 (possibly repeated), that every even digit was followed by an odd digit, and every odd digit was followed by an even digit, and the first digit is 1. How many possible combinations does Jason need to try?

 Dec 13, 2021
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1*2*3*2*3 = 36 posibilities.

 

But if he gets it right on the first try then he doesn't need to try any more.  wink

 Dec 15, 2021

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