The symbol（符号） is called four factorial（阶乘）and means 4×3×2×1

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The symbol（符号） is called four factorial（阶乘）and means 4×3×2×1; thus（则） =24.the true one of the following statements is _____.
(A)5!+4!=9!(B)5!-4!=1
(C)5!.=20!(D)5!+4!=5

没对的

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