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freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-209-circular-logic.md

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---
id: 5900f43e1000cf542c50ff4f
title: 问题209循环逻辑
challengeType: 5
videoUrl: ''
---
# --description--
k输入二进制真值表是从k个输入位二进制数字0 \[假]或1 \[真]到1个输出位的映射。例如逻辑AND和XOR函数的2输入二进制真值表是
x y x AND y000010100111x y x XOR y000011101110多个6输入二进制真值表τ满足公式
所有6位输入abcτabcdef和τbcdef一个XORb和c= 0 def
# --hints--
`euler209()`应该返回15964587728784。
```js
assert.strictEqual(euler209(), 15964587728784);
```
# --solutions--