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讓個位數是5且必須是三位數,即為利用1,2,3,4組成不同的兩位數即可.12,13,14,16;21,23,24,26;31,32,34,36;41,42,43,46;61,62,63,64;共4×5=20(種)答:用1、2、3、4、5、6可以組成20個沒有重複數位的、個位是5的三位數.
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