Question 303471
how many license plates can there be if it 
consists of 4 letters and 3 digits?
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If repetition is allowed, the answer is 26^4*10^3 = 456,976,000
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If repetition is not allowed, the answer is 26*25*24*23*10*9*8
= 258,336,000
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Cheers,
Stan H.