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curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-389-platonic-dice.md
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---
id: 5900f4f21000cf542c510004
title: 问题389：柏拉图式骰子
title: 'Problem 389: Platonic Dice'
challengeType: 5
videoUrl: ''
forumTopicId: 302053
dashedName: problem-389-platonic-dice
---
# --description--
抛出一个无偏的单面4面模具，并注明其值T.T无偏见的6面骰子被抛出并且它们的分数加在一起。记录总和C.C抛出无偏见的8面骰子并将它们的分数加在一起。记录总和O.O无偏见的12面骰子被投掷并且他们的分数被加在一起。记录总和D.D抛出无偏的20面骰子并将它们的分数加在一起。总和，我，注意到。找出I的方差，并将答案四舍五入到小数点后4位。
An unbiased single 4-sided die is thrown and its value, T, is noted.T unbiased 6-sided dice are thrown and their scores are added together. The sum, C, is noted.C unbiased 8-sided dice are thrown and their scores are added together. The sum, O, is noted.O unbiased 12-sided dice are thrown and their scores are added together. The sum, D, is noted.D unbiased 20-sided dice are thrown and their scores are added together. The sum, I, is noted.
Find the variance of I, and give your answer rounded to 4 decimal places.
# --hints--
`euler389()`应该返回2406376.3623。
`euler389()` should return 2406376.3623.
```js
assert.strictEqual(euler389(), 2406376.3623);