## Math Problem Statement

有 8 个，其中两个人不能挨在一块，有多少种可能？

## Solution

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## Math Problem Analysis

### Mathematical Concepts

Combinatorics

Permutations

Inclusion-Exclusion Principle

### Formulas

8! = 40320

2 × 7! = 10080

8! - 2 × 7! = 30240

### Theorems

Inclusion-Exclusion Principle

### Suitable Grade Level

Grades 8-10

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