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The numbers 2, 3, 5, 7, 11, 13, 17 and 19 are prime.
There are no whole numbers between 5 and 6 because they are consecutive to one another in the number series.
To find the numbers between 400 and 600 that either begin or end with the digit 5, we can break it down into two parts. First, let's find the numbers that begin with 5: There are 10 numbers between 500 and 599 that start with 5. Next, let's find the numbers that end with 5: There are 10 numbers between 405 and 595 that end with 5. Adding these two sets together gives us a total of 20 numbers between 400 and 600 that either begin or end with the digit 5.
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The odd numbers between 1 and 10 are 1, 3, 5, 7, and 9.