Every resident of Sponge City owns one, and only one, car. Every license plate is different and consists of one letter (A - Z) and one single-digit number (0 - 9). Either the letter or the number can come first. If every possible combination is used, how many people live in Sponge City?
Answer:
520 ........... 26 X 10 = 260 / 260 X 2 = 520 (since the letter and number can come in either order)
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