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In a game manual, there is a description of a rare item that sometimes appears
instead of a regular one. The rule determining when this rare item appears is
this:

> 16回に１度、Ｘのかわりに出現。

In an [earlier
question](https://japanese.stackexchange.com/questions/60365/%E3%81%8C-meaning-
or/60415) concerning the same sentence I got quite a lot of answers with
translation. Every answer translates the condition as

> Once every 16 times

However I am still not sure whether this means:

  * There is a probability of 1/16 that a rare item appears.
  * The rare item appears every 16th time.

Which one is correct? And, how to express the second one in Japanese?
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2018-08-23T20:36:20.480
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question
translation usage counters numbers
＃回に＃度: probability or sequence?
> 16回に1度

means literally "once per 16 times", but I would understand it as " _on
average_ once every sixteen times" (which means a probability of 1/16, i.e. a
ratio of 1:15).

"Every 16th time" could be translated

> 16回ごとに

Here ごと is 毎【ごと】, e.g.

> ご利用10回毎に2,000Pプレゼント!  
>  Receive 2,000 points with every tenth use!

(Of course I cannot say how your game is programmed, and every sixteenth time
would imply a probability of 1/16, but not the other way around.)
CC BY-SA 4.0
2018-08-23T22:06:01.627
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answer