a.)How many different numbers of 4 digits may be formed with the digits0,1,2,5,6,7,8 if no digit is used more than once in any number?
b.)How many of the numbers formed in are even?
c.)Find the sum of all the numbers formed in(a).
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2007-09-16 3:29 am
回答 (1)
2007-09-16 4:43 am
✔ 最佳答案
a 6x6xx5x4 = 720b 6x5x4+5x5x4x3 = 420
c. 6x5x4x29x1000 + 5x5x4x29x100 + 5x5x4x29x10 + 5x5x4x29 = 3801900
收錄日期: 2021-04-25 22:07:16
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https://hk.answers.yahoo.com/question/index?qid=20070915000051KK04228