The period 1985 through 2007 covers how many years?

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Multiple Choice

The period 1985 through 2007 covers how many years?

Explanation:
Inclusive counting of a range includes both endpoints. The period from 1985 through 2007 includes 1985 and 2007, plus every year in between. So compute 2007 − 1985 = 22, then add 1 to account for the starting year, giving 23. You can think of listing the years: 1985, 1986, 1987, ... up to 2007, which makes 23 years. The other numbers don’t fit because they don’t reflect including both ends; they would come from omitting one end or miscounting. Therefore, the period spans 23 years.

Inclusive counting of a range includes both endpoints. The period from 1985 through 2007 includes 1985 and 2007, plus every year in between. So compute 2007 − 1985 = 22, then add 1 to account for the starting year, giving 23. You can think of listing the years: 1985, 1986, 1987, ... up to 2007, which makes 23 years. The other numbers don’t fit because they don’t reflect including both ends; they would come from omitting one end or miscounting. Therefore, the period spans 23 years.

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