Think about it. There are 10 numbers plus 25 letters (excluding O).
Therefore there are 35 possibilities for a plate with one number or letter.
There are 35 x 35 = 1225 for two.
35 x 35 x 35 = 42,875, for three.
35 x 35 x 35 x 35 = 1,500,625, enough for many states.
35 x 35 x 35 x 35 x 35 = 52,521,875, enough for any state.
35 to the sixth power = 1,838,265,625, enough for the world!
35 to the seventh power = 64,339,290,000, completely unnecessary!
Yet there are many states with plates having 7 letters + numbers.
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