Between 500 and 1000, how many integers are multiples of 5?How do I read this?
Are 500 and 1000 excluded?
So that I would be finding how many integers are multiples of 5 starting at 501 and ending with 999?
The solution seems to start with 500 and end with 999 ------
Reading (& re-reading) Chung's solution, it's apparent he means that 500 and 1000 are excluded, but his way of writing the solution is so different from the way I would write it that it looks like he's including 500 but excluding 1000.
His solution also seems to imply that you find the number of integers between 100 and 199 inclusive (i.e. how many integers starting with 100 and ending with 199) is to subtract 100 from 199.
Chung's book seems to be fantastically useful, but I'm wondering whether you need to be already scoring a 700 or so to understand it.
I will soldier on.