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Help with Probability Word Problem

label Algebra
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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.)

Dec 2nd, 2014

1 - P(all different) = 1 - 10*26*25*24*9*8*7/(26^3*10^4) 

= 0.5527 -> 0.6 

https://answers.yahoo.com/question/index?qid=20130228162449AAI3bIg

Dec 2nd, 2014

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