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4 不用考慮10!到2004!之和,因為它們最後兩位數一定是00. 1!+2!+3!+4!+5!+6!+7!+8!+9! =1+2+6+24+120+720+5040+40320+362880 =409113 所以最後兩位數之和是4.
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