What is the probability of getting a license plate that has a repeated
letter or digit if you live in a state in which license plates have one
numeral followed by three letters followed by three numerals? (Round
answer to one decimal place.)
1 - P(all different) = 1 - 10*26*25*24*9*8*7/(26^3*10^4) = 0.5527 -> 0.6
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