how many 4 digits numbers can be formed 0,1,2,3 without repetition
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The answer is 24. Cosider 4 box.in first box 3 numbers can be put(1,2,3) then in second board there must be 3 numbers (012 or 013 or 123 or 023),in third box there must be 2 numbers and in last there must be only 1 number. The answer is 18.
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1023, 2013, 3012, 1032, 2031
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