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According to the U.S. Census, the U.S. population in January, 2013 reached 315,243,585. That’s a lot of people, and a lot of digits!

Digits are symbols we use to write numbers. The digits we commonly use are 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.

For instance, the number 1,429 has four digits: 1, 4, 2, and 9. There are 9 digits in the number 315,243,585.

How many digits are there in the number 642?

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