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posted @ 2019-04-05 16:19
LXL_1
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# Topic: There are four digits: 1, 2, 3 and 4. # How many different three digits can be formed without repeating numbers? How much is each? # Procedure analysis: traverse all possibilities and shav... 阅读全文
posted @ 2019-04-05 14:14
LXL_1
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