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OpenStudy (anonymous):
) How many four-digit numbers csan be formed from the digits 1,3,5,7,8, and 9 if each digit can be used at most once in each number?
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OpenStudy (anonymous):
the number of combinations of 4 from 6 =6!/4 !* 2! = 15 each of these 4 digit numbers can be arranged in 4! ways - 24 wYS SO TOTal no. of ways = 15*24 = 360
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