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February 28, 2015

February 28, 2015

Posted by **susie** on Monday, April 25, 2011 at 10:54pm.

- algebra -
**MathMate**, Monday, April 25, 2011 at 11:48pmNumber of all possible plates

N1=26³*10³

Number of plates with unique letters AND unique digits

N2=26*25*24*10*9*8

The difference of N1 and N2 gives the number of plates with at least one repeated digit or letter.

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