[計量] 題目看不懂,請幫忙謝謝!
Given Set={1,3,4,5,7,8,9}
Col a: number of ways in which 5 digit number can be formed
Col b: 7*6*5*4*3
Ans: A
A選項不懂意思
請好心人幫解 謝謝!
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12/12 00:57, , 5F
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