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Posted by on Saturday, August 3, 2013 at 3:42pm.

If digits cannot be repeated, how many four-digit numbers can be made using the digits 1, 3, 5,7, and 9 ?

  • math - , Saturday, August 3, 2013 at 3:45pm

    5*4*3*2 = 120

    Each time you choose a digit, the number remaining goes down by one.

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