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Sum=Sum!

Number Theory Level 3

Find the number of ordered n-tuple of solutions $(a_1, a_2, a_3, ..., a_n)$ of the equation $a_1+a_2+a_3+...+a_n=a_1!+a_2!+a_3!+...+a_n!$

3^n

2^n

1 0

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by 敬全钟

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