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Mr. Chen, Mr. Zhang and Mr. Li all have several teaching situations of Chinese, mathematics and English.
Teacher Chen, Teacher Zhang, Teacher Li, Chinese and Math English have six teaching situations. This is a complete permutation and combination problem. The permutation and combination formula is n! = Nx(N- 1)×(N-2)×(N-3)x…x 1

The teaching situation is 3×2× 1=6.

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