Question 317637
We want to form a license plate using 4 letters (A-Z) followed by 3 numbers (0-9).  Both may be used more then once.  A license plate is chosen randomly.  What is the probability that the letter A is not used?
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Number of plates with no "A" = 25^4*10^3
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Number of plates with no restriction = 26^4*10^3
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P(letter A not used) = 25^4/26^4 = 0.8548
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Cheers,
Stan H.