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See image below for my question.

 Nov 20, 2017
 #1
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8 keys are no good there are only 6 possible keys left so the chance that the next one is good is 1/6

 

The next is 1 in 4 which means there are 4 keys left, 

tries 4th last, no good :(

tries 3rd last, no good :(

tries second last, good great, no good doesn't matter, it has to be the last one.

 

So the worst scenario is that 3 more keys must be tried :)

 Nov 20, 2017

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