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Open, Sesame! (Posted on 2014-10-14) Difficulty: 1 of 5
There are n keys in the bundle, but only one fits the door's lock.
Trying them one after another, until the right one will be found, what is the probability it will happen on the kth trial?

No Solution Yet Submitted by Ady TZIDON    
Rating: 2.0000 (1 votes)

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Solution If the key fits ... (spoiler) | Comment 1 of 3
1/n, since the correct key is equally likely to be the 1st, 2nd, ... nth
  Posted by Steve Herman on 2014-10-14 20:58:43
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