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20 June, 09:23

A box contains five keys, only one of which will open a lock. keys are randomly selected and tried, one at a time, until the lock is opened (keys that do not work are discarded before another is tried). let y be the number of the trial on which the lock is opened

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  1. 20 June, 13:15
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    Each key is 1/5 the way for the door to be open
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