Sean runs 3 miles in 21 minutes , Gwen runs 4 miles in 32 minutes ,Marc runs 5 miles in 30 minutes. Who has the fastest average
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We have 26 letters and 10 digits.
So, we have 26 choices for the first letter, 25 choices for the second letter (we can't pick the one we already chose), and 10 choices per digit (we can always choose any digit, because we can repeat them).
This leads to a total of
possible car targs.