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21-11-2016
Mathematics

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how many four-digit numbers can be formed from the numbers 1,3,4,6,8 and 9 if repetition of digits is not allowed ?

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mozarth11 mozarth11

21-11-2016

1,3,4,6,8,9
6 algarismos
6*5*4*3*2*1 = 720

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