>>573
>箱入り無数目では出題は試行でないので適用できません

わっはっは ；ｐ）

https://ja.wikipedia.org/wiki/%E8%A9%A6%E8%A1%8C_(%E7%A2%BA%E7%8E%87%E8%AB%96)
試行 (確率論)
確率論において、試行（しこう、英: trial, experiment）とは、起こりうる結果がいくつかあり、そのどれか1つだけが偶然で起こる流れのことである[1]。試行の結果全体の集合は標本空間（全事象）と呼ばれる。

特に起こりうる結果が2つしかない試行はベルヌーイ試行と呼ばれる[2]。

試行の結果のいくつかからなる集合で、起こる割合が決まっていると考えられるものを事象という。事象に対してそれの起こる割合を確率という。

1つの試行を繰り返すことにより、事象の確率を評価することができる（統計的確率）。根元事象に確率変数（一般には確率要素）を割り当てることにより確率質量関数か確率密度関数が決まり、試行は確率分布として定量化できる

https://en.wikipedia.org/wiki/Experiment_(probability_theory)
Experiment (probability theory)

In probability theory, an experiment or trial (see below) is any procedure that can be infinitely repeated and has a well-defined set of possible outcomes, known as the sample space.[1] An experiment is said to be random if it has more than one possible outcome, and deterministic if it has only one. A random experiment that has exactly two (mutually exclusive) possible outcomes is known as a Bernoulli trial.[2]

When an experiment is conducted, one (and only one) outcome results— although this outcome may be included in any number of events, all of which would be said to have occurred on that trial. After conducting many trials of the same experiment and pooling the results, an experimenter can begin to assess the empirical probabilities of the various outcomes and events that can occur in the experiment and apply the methods of statistical analysis.

Experiments and trials
Random experiments are often conducted repeatedly, so that the collective results may be subjected to statistical analysis. A fixed number of repetitions of the same experiment can be thought of as a composed experiment, in which case the individual repetitions are called trials. For example, if one were to toss the same coin one hundred times and record each result, each toss would be considered a trial within the experiment composed of all hundred tosses.[3]

Mathematical description
Main article: Probability space