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The First Repeat (Posted on 2016-07-18) Difficulty: 3 of 5
A bag has 5 tokens numbered 1 to 5. Tokens are drawn with replacement until a token is repeated. What is the probability that the repeated token is the first token drawn?

What is the formula for N tokens?

No Solution Yet Submitted by Brian Smith    
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Some Thoughts re(2): answers | Comment 4 of 5 |
(In reply to re: answers by Charlie)

I realized my error the moment I saw your post.

Not only I have misunderstood the original problem: (what is the reciprocal of steps counted until the 1st token is drawn for the second time - - that's the way I perceived it)- but I ERRED in the indexes and the answers for "my question"  - the answers s.b. 1/6  and 1/(N+1)RESPECTIVELY.

sorry.


  Posted by Ady TZIDON on 2016-07-18 15:24:44
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