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数学
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with 1234can from how many different four-digit number?
不用翻译，写个过程就行了。好的给十分！
人气：470 ℃ 时间：2020-02-05 09:22:58
解答
1234能重复吗?
如果不能重复.那就是4X3X2X1=24种
如果能重复,那就是4的4次方种
希望我的回答对你有帮助^-^
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