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Random numbers sum together (Posted on 2015-05-15) Difficulty: 2 of 5
If three random integers are independently chosen from 1 to n, what is the probability that the first two sum to the third?

Source: Quora

No Solution Yet Submitted by Jer    
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re(2): solution: as presented and with a complication Comment 3 of 3 |
(In reply to re: solution: as presented and with a complication by Steve Herman)

Yes, as I thought about it later, I recognized that that way of looking at it works. I was making it more complicated than necessary. Oh, well, at least looking at it a different way is an independent verification the formula is correct.
  Posted by Charlie on 2015-05-15 13:56:06

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