The question is ambiguous. It is in complete.
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How many license plates can be made using either two uppercase English letters followed by four digits or two digits followed by four uppercase English letters?
35,152,000 (assuming that 000 is a valid number, and that no letter combinations are disallowed for offensive connotations.) Also, no letters are disallowed because of possible confusion between letters and numbers eg 0 and O.
it 26 to the power 4 and then 99 for the numbers figure that out add the two together
It is possible to create a 3-digit number, without repeated digits so the probability is 1.
2600